Tutorials
Writing good prompts is one of the most important skills in AI image generation. Clear, structured prompts help the model understand your intent and produce more consistent, high-quality results.
This guide explains how prompts work and how to write better prompts when using NanoBanana or similar AI image tools.
A prompt is a text description that tells the AI model what kind of image to generate.
Prompts can describe:
The more clearly you describe your intent, the better the results are likely to be.
Every good prompt begins with a clear subject.
Instead of vague descriptions, be specific about what you want to generate.
Example
Not enough: "A character"
Better: "A fantasy warrior wearing silver armor, standing on a mountain ridge"
Defining the subject early helps the model focus on the main visual idea.
After the subject, describe the visual style you want.
Styles can include:
Example: "A fantasy warrior wearing silver armor, digital illustration, dramatic lighting"
You can combine multiple style descriptors, but avoid adding too many conflicting styles.
Mood and atmosphere significantly affect the final image.
Common mood descriptors include:
Example: "A fantasy warrior wearing silver armor, digital illustration, dark cinematic mood, stormy sky"
For more control, you can include composition or camera-related details.
Example: "Close-up portrait of a fantasy warrior wearing silver armor, digital illustration, cinematic lighting"
These details help guide framing and perspective.
Quality-related words can influence clarity and detail.
Common descriptors:
Use these sparingly to avoid overloading the prompt.
Well-structured prompts are easier for the model to interpret.
A common structure is:
Subject + Style + Mood + Details
Example: "A fantasy warrior wearing silver armor, digital illustration, dark cinematic mood, dramatic lighting, high detail"
Avoid long, unstructured sentences filled with unrelated ideas.
AI image generation often requires iteration.
If the result is not what you expected:
Small changes can significantly improve results.
Simple and focused prompts usually perform better than overly complex ones.
Prompts behave differently depending on the generation mode.
For image-to-image, shorter and more targeted prompts often work best.
Here are a few simple prompt examples you can experiment with:
Testing different prompt styles helps build intuition over time.
Prompt writing is a skill that improves with practice. There is no single "perfect" prompt - the best results come from experimenting, observing outputs, and refining descriptions.
NanoBanana is designed as an experimental environment where users can explore prompt writing without complexity.
Keep exploring prompt craft and NanoBanana basics with these guides: