AI Image Generation Prompt Techniques

Introduction

Nano Generator uses natural language descriptions to generate images. Writing good prompts is the key to achieving ideal results. Here are techniques and best practices for writing effective prompts.

The quality of prompts directly affects the results of generated images. Spending time optimizing prompts often yields better results.

Prompt Basics

We use natural language to describe the image content we want to generate. A good prompt should be clear, specific, and contain sufficient details.

Basic Structure

A complete prompt usually includes the following parts:

Subject Description + Style Description + Quality Description + Composition Description

Example:
A girl in a red dress standing under cherry blossoms, Japanese illustration style, soft colors, high detail, front view, shallow depth of field

Subject Description

Describe the main content and objects in the image:

- People: A smiling young woman
- Animals: An orange cat
- Scenes: Modern city streets
- Objects: A vintage-style coffee cup

Style Description

Specify the artistic style and visual effects:

- Artistic Style: Watercolor, oil painting, illustration, 3D rendering
- Color Style: Soft, vibrant, black and white, monochrome
- Era Style: Vintage, modern, futuristic
- Cultural Style: Japanese, Chinese, European

Quality Description

Specify image quality and detail level:

- Resolution: HD, 4K, 8K
- Detail: Fine, ultra-detailed, professional-grade
- Quality: High quality, best quality, masterpiece

Composition Description

Describe the composition and perspective:

- Perspective: Front, side, top-down, bottom-up
- Depth of Field: Shallow, deep
- Composition: Centered, rule of thirds, symmetrical
- Lighting: Natural light, soft light, strong light, backlight

Advanced Techniques

Weight Control

Use parentheses to adjust keyword importance:

(keyword) - Increase weight by 1.1x
((keyword)) - Increase weight by 1.21x
[keyword] - Decrease weight by 0.9x

Example:
((masterpiece)), best quality, (detailed), 8k resolution

Negative Prompts

Use negative prompts to exclude unwanted elements:

Negative prompt examples:
- low quality, blurry, distorted
- extra fingers, bad anatomy
- watermark, text overlay
- oversaturated, unnatural colors

Style Mixing

Combining multiple styles can create unique effects:

Examples:
cyberpunk + watercolor + minimalist
anime + oil painting + vintage
realistic + cartoon + surreal

Practical Examples

Portrait

Prompt:
An elegant woman, long hair, smiling, professional photography, soft natural light, shallow depth of field, high detail

Negative Prompt:
low quality, blurry, distorted, extra fingers

Landscape

Prompt:
Majestic mountain landscape, sunrise, golden sunlight, sea of clouds, wide-angle lens, 4K HD, cinematic quality

Negative Prompt:
people, buildings, vehicles

Product Image

Prompt:
Modern minimalist coffee cup, white background, professional product photography, soft lighting, high detail, commercial-grade quality

Negative Prompt:
cluttered background, shadows, reflections

Artistic Creation

Prompt:
((masterpiece)), best quality, detailed, 8k resolution, 
cyberpunk cityscape, neon lights, futuristic, 
watercolor style, vibrant colors, dynamic composition

Negative Prompt:
low quality, blurry, distorted, bad anatomy

Common Mistakes

Prompt Too Simple

❌ Wrong: A cat
✅ Correct: An orange short-haired cat, sitting on a windowsill, sunlight through the window, soft natural light, high detail

Prompt Too Complex

❌ Wrong: A complex scene with many details, containing many elements, diverse styles...
✅ Correct: A modern minimalist living room, Nordic style, natural light, high detail

Ignoring Negative Prompts

❌ Wrong: Only write positive prompts
✅ Correct: Positive prompts + Negative prompts (exclude unwanted elements)

Optimization Tips

Start Simple: Begin with a simple prompt, then gradually add details
Iterate and Optimize: Don't expect perfection on the first try, try and adjust multiple times
Learn from Examples: Reference excellent prompts shared by other users
Record Success Cases: Save effective prompts for future use
Experiment with Combinations: Try different style and parameter combinations