nano-banana-prompts — quality + safety report

---
name: nano-banana-prompts
description: Generate optimized prompts for Gemini 2.5 Flash Image (Nano Banana). Use for image generation, crafting photo prompts, art styles, or multi-turn editing workflows with best practices.
license: MIT
---

# Nano Banana Image Prompt Generator

Generate high-quality prompts for Gemini 2.5 Flash Image using proven best practices from October 2025.

## Core Principle

**Describe scenes naturally, don't list keywords.**

❌ `woman, business suit, office, professional`
✅ `A professional businesswoman in navy suit stands confidently in modern glass-walled office overlooking city skyline. Warm afternoon light streams through windows.`

## Prompt Structure

### Basic Template

```
A [SHOT TYPE] of [SUBJECT] [ACTION] in [ENVIRONMENT]. 
[LIGHTING] creates [MOOD]. [CAMERA/STYLE DETAILS]. [ASPECT RATIO].
```

### Components

1. **Subject & Action** - Who/what and what they're doing
2. **Setting** - Where the scene takes place
3. **Lighting** - Natural/artificial light sources and quality
4. **Mood** - Emotional tone or atmosphere
5. **Technical Details** - Camera, lens, style specifics
6. **Format** - Aspect ratio or dimensions

## Prompt Length

- **Short (10-20 words)**: Quick generation, minimal control
- **Medium (50-100 words)**: ⭐ RECOMMENDED - balanced control
- **Long (100-200 words)**: Maximum control for complex scenes

## Photography Prompts

### Template
```
Photorealistic [SHOT TYPE] of [SUBJECT], [ACTION], in [ENVIRONMENT]. 
Illuminated by [LIGHTING], creating [MOOD]. Captured with [CAMERA/LENS], 
emphasizing [DETAILS]. [ASPECT RATIO] format.
```

### Camera Control

**Lenses:**
- 35mm, 50mm (standard)
- 85mm portrait (close-ups)
- 10-24mm wide (landscapes)
- 60-105mm macro (details)

**Lighting:**
- Golden hour (warm, soft)
- Blue hour (cool, atmospheric)
- Three-point (studio)
- Dramatic side (high contrast)
- Rembrandt (classic portrait)

**Settings:**
- Shallow DOF: f/1.4-2.8 (blurred background)
- Deep focus: f/11-22 (everything sharp)
- Motion blur for action

### Example
```
Professional corporate headshot of mid-30s woman with shoulder-length brown hair 
in charcoal blazer. She's smiling warmly at camera against soft gray backdrop. 
Shot with 85mm f/2.0, studio three-point lighting creates gentle shadows defining 
facial features. Ultra-high resolution, LinkedIn-ready quality. 1:1 format.
```

## Art & Illustration Prompts

### Template
```
[STYLE] illustration of [SUBJECT] [ACTION/POSE]. [COMPOSITION] with 
[COLOR PALETTE]. [TECHNIQUE/MEDIUM]. Inspired by [REFERENCE], 
emphasizing [QUALITIES].
```

### Common Styles
- Watercolor painting
- Digital art
- Oil painting
- Pencil sketch
- Ink drawing
- Anime/manga
- Pixel art
- Minimalist vector

### Example
```
Watercolor illustration of young girl reading book under oak tree. Seated 
cross-legged in sun-dappled clearing with wildflowers. Soft, loose brushstrokes 
with pastel color palette of greens, yellows, pinks. Transparent washes create 
dreamy, ethereal quality. Inspired by children's book illustration, emphasizing 
wonder and tranquility. 4:5 portrait format.
```

## Text Rendering

**Best Practices:**
- Keep under 25 characters total
- Maximum 2-3 phrases
- Specify font style (bold, script, sans-serif)
- Put exact text in quotes
- Describe position explicitly

**Example:**
```
Movie poster with bold red text "SUMMER" at top and "Adventure Awaits" 
in white script font at bottom. Ocean sunset background. Cinematic style.
```

## Multi-Turn Editing Workflow

Nano Banana excels at conversational editing. Make one change at a time.

**Example sequence:**
1. "Create professional headshot of woman in business attire"
2. "Change background to modern office"
3. "Make her wearing glasses"
4. "Add warmer lighting"

## Product Photography

### Template
```
High-resolution product photo of [PRODUCT] on [SURFACE]. [LIGHTING] 
to [PURPOSE]. Camera angle: [TYPE] to showcase [FEATURE]. Ultra-realistic, 
sharp focus on [DETAIL]. [ASPECT RATIO].
```

### Example
```
High-resolution product photo of stainless steel smartwatch on white marble 
surface. Soft diffused studio lighting from 45-degree angle to minimize 
reflections and show screen clearly. Camera angle: slight overhead to showcase 
circular face and metal band texture. Ultra-realistic, sharp focus on watch 
face display. 1:1 format for e-commerce.
```

## Landscape Photography

### Template
```
[TYPE] landscape of [LOCATION] at [TIME]. [WEATHER/ATMOSPHERE]. 
[FOREGROUND ELEMENTS]. Shot with [LENS] from [VANTAGE POINT]. 
[COMPOSITION]. Professional landscape photography with [GRADING]. [MOOD].
```

### Example
```
Dramatic landscape of mountain lake at golden hour. Wispy clouds catch 
warm orange light over snow-capped peaks. Weathered dock extends into 
mirror-still water as foreground. Shot with 16mm wide-angle from low 
lakeside vantage. Rule-of-thirds composition places horizon in upper third. 
Professional landscape photography with warm color grading. Serene yet majestic.
```

## Abstract Art

### Template
```
[MOVEMENT] abstract exploring [CONCEPT]. [COMPOSITION] with [COLORS/TEXTURES]. 
[MEDIUM] emphasizing [GOALS]. [CONTEXT].
```

### Example
```
Bold geometric abstract exploring tension and harmony. Overlapping angular 
shapes with vibrant primary colors against deep black. Digital art emphasizing 
sharp edges and color interaction. Large-scale wall art format, 16:9.
```

## Common Pitfalls

**Avoid:**
- Keyword lists without context
- Vague descriptions
- Conflicting style instructions
- Overly complex text rendering
- Too many simultaneous changes in edits

**Instead:**
- Use complete sentences
- Be specific about details
- Maintain style consistency
- Keep text simple
- Edit iteratively

## Style References

When requesting specific artistic styles, reference:
- Art movements (impressionism, art deco)
- Artists (in style of Van Gogh's brushwork)
- Media (watercolor, oil painting, digital art)
- Eras (1950s photography, modern minimalist)

## Aspect Ratios

- **1:1** - Square (social media, profile pics)
- **16:9** - Landscape (presentations, headers)
- **9:16** - Portrait (mobile, stories)
- **4:5** - Portrait (Instagram posts)
- **2:3** - Classic portrait
- **3:2** - Standard photo

## Quick Prompt Checklist

✅ Subject clearly described
✅ Action or pose specified
✅ Environment/setting detailed
✅ Lighting source and quality
✅ Mood or atmosphere
✅ Style or technical specs
✅ Aspect ratio chosen
✅ Complete sentences, not keywords

## Common Issues & Solutions

### Prompt Quality Issues

**Issue**: Generic or vague output
**Cause**: Prompt too short or lacks specificity
**Solution**: Expand to 50-100 words. Add lighting details, mood, and specific technical specs (lens, style, etc.).

**Example**:
- ❌ Too vague: "A woman in an office"
- ✅ Specific: "Professional businesswoman in navy suit stands confidently in modern glass-walled office overlooking city skyline at golden hour. Warm afternoon light streams through floor-to-ceiling windows creating soft rim lighting. Shot with 50mm f/2.0, shallow depth of field blurs cityscape background. Confident yet approachable mood. 4:5 portrait format."

**Issue**: Conflicting style instructions
**Cause**: Mixing incompatible styles (e.g., "photorealistic watercolor")
**Solution**: Choose one primary style. For photography, use camera terminology. For art, use medium/technique terminology.

**Issue**: Text rendering failures
**Cause**: Too much text, complex fonts, or unclear positioning
**Solution**:
- Limit to under 25 characters total
- Use simple, clear fonts (bold, script, sans-serif)
- Specify exact position ("at top", "centered", "bottom right")
- Put text in quotes: "SUMMER"

**Issue**: Unwanted elements in image
**Cause**: Ambiguous phrasing or conflicting descriptors
**Solution**: Be explicit about what should NOT appear. Use precise, unambiguous language.

### Generation Issues

**Issue**: Image doesn't match prompt
**Cause**: Prompt too complex or contradictory elements
**Solution**:
1. Simplify prompt to core concept
2. Use multi-turn editing workflow
3. Start basic, refine iteratively

**Issue**: Inconsistent results across generations
**Cause**: Vague descriptors allowing wide interpretation
**Solution**: Add specific details about colors, materials, lighting angles, camera settings, and composition rules (rule of thirds, golden ratio).

**Issue**: Poor composition
**Cause**: No compositional guidance in prompt
**Solution**: Explicitly mention composition rules:
- "Rule of thirds composition"
- "Centered subject with symmetrical framing"
- "Leading lines draw eye to focal point"
- "Foreground, mid-ground, background layers"

### Multi-Turn Editing Issues

**Issue**: Too many changes at once causing confusion
**Cause**: Requesting multiple edits simultaneously
**Solution**: Make one change per turn. Wait for result before next edit.

**Example sequence**:
1. ✅ "Change background to sunset"
2. ✅ "Make the lighting warmer"
3. ✅ "Add reflections on water"
vs.
4. ❌ "Change background to sunset with warmer lighting and add reflections"

**Issue**: Losing context from earlier turns
**Cause**: Vague references without reinforcing key details
**Solution**: Briefly reinforce context: "In this mountain landscape, add a hiking trail in the foreground"

## Prompt Validation

Before submitting a prompt, verify:

### Content Completeness
- [ ] Subject clearly identified (who/what)
- [ ] Action or state described (what subject is doing)
- [ ] Environment/setting specified (where)
- [ ] Lighting described (source, quality, direction)
- [ ] Mood or atmosphere indicated (emotional tone)
- [ ] Style or medium specified (photography, watercolor, etc.)
- [ ] Aspect ratio chosen (1:1, 16:9, 4:5, etc.)

### Technical Specifications

**For Photography:**
- [ ] Camera/lens mentioned (50mm, 85mm, wide-angle)
- [ ] Camera settings if relevant (f/2.8, shallow DOF)
- [ ] Lighting type (golden hour, studio three-point, dramatic side)
- [ ] Shot type (close-up, wide shot, overhead)

**For Art/Illustration:**
- [ ] Medium specified (watercolor, digital art, oil painting)
- [ ] Technique mentioned (loose brushstrokes, sharp vector)
- [ ] Color palette described (pastels, vibrant, monochrome)
- [ ] Style reference if applicable (children's book, manga, minimalist)

### Quality Checks
- [ ] Uses complete sentences, not keyword lists
- [ ] Specific rather than vague ("charcoal blazer" vs. "suit")
- [ ] No conflicting style instructions
- [ ] Text under 25 characters if included
- [ ] Length appropriate: 50-100 words for balanced control
- [ ] No contradictory elements (photorealistic watercolor)

### Text Rendering Validation

If prompt includes text:
- [ ] Total characters under 25
- [ ] Maximum 2-3 text phrases
- [ ] Text in quotes ("SUMMER")
- [ ] Font style specified (bold, script, sans-serif)
- [ ] Position explicitly stated (top, bottom, centered)
- [ ] Text color contrasts with background

## Testing Your Prompts

### Quick Test
Generate image and evaluate:
1. **Subject accuracy**: Is the main subject as described?
2. **Composition**: Does layout match prompt intent?
3. **Lighting**: Is lighting source and quality correct?
4. **Style**: Does aesthetic match requested style?
5. **Technical specs**: Are camera/art specs honored?
6. **Mood**: Does image convey intended atmosphere?

### Refinement Workflow

If image doesn't match expectations:

**Step 1: Identify the gap**
- What element is wrong/missing?
- Is it subject, lighting, style, composition, or mood?

**Step 2: Use multi-turn editing**
- Don't regenerate from scratch
- Make targeted edit: "Make the lighting softer"
- One change at a time

**Step 3: Refine prompt for future use**
- If you need to regenerate, add more specificity to weak areas
- Save successful prompts as templates

### Comparison Test

For critical images, generate 2-3 variations with slightly different prompts:

**Version A**: Medium detail (50-75 words)
**Version B**: Hig

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