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. | The Nano Banana Prompt Formula Nobody Told You About PRADIP KAITY, Sep 5, 2025 |
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You’ve probably had this happen: you type in a prompt, hit generate, and the AI spits out something completely different from what you had in mind.
Instead of swapping a shirt, the AI changes the person’s face.
Frustrating, right?
The truth is, the AI isn’t broken — it’s just following your instructions a little too literally.
And that’s where prompts come in. A prompt is simply the way you talk to AI.
The clearer and more structured your conversation, the better the AI understands what you want.
Think of it like giving directions. If you just say go that way, you’ll end up lost.
But if you give step-by-step instructions, you’ll arrive exactly where you need to be.
In this guide, you’ll learn a simple formula that makes Nano Banana behave the way you want.
First, we’ll break down the image generation formula so you can create polished results from scratch.
Then we’ll move on to the editing formula, where you’ll discover how to make changes without messing up the rest of the image.
By the end, you’ll know how to craft prompts that actually work — every time.
Ready? Let’s begin…
What is a Prompt?
A prompt is just the way you talk to AI.
Think of it like giving directions. If you say make something nice, the AI has no clue what you actually mean.
The way you phrase your request decides whether you get exactly what you pictured — or something random that makes no sense.
Once you learn how to structure prompts properly, the AI stops guessing and starts delivering.
The Nano Banana Prompt Formula for Image Generation
If you’ve ever felt like AI image generation is a game of luck, here’s the good news — it’s not.
With Nano Banana, there’s a straightforward formula you can use to guide the AI step by step.
Think of it like a recipe: follow the ingredients in order, and you’ll get a consistent result.
The formula looks like this:
Subject + Action + Environment + Art Style + Lighting + Details
Let’s break it
down:
- Subject: Who or what should the image focus on? Example: a young woman with freckles.
- Action: What are they doing? Example: smiling thoughtfully, sitting on a bench.
- Environment: Where are
they? Example: inside a cozy cafe.
- Art Style: What style
or medium should the AI imitate? This could be shot on Canon 5D
for a realistic photo, or digital illustration for an
artistic vibe.
- Lighting: The mood
depends heavily on this. Example: natural light by the window.
- Details: Extra touches to tie it all together. Example: warm and inviting.
Now, put it all together:
A young woman with freckles, smiling thoughtfully, sitting on a bench inside a cozy cafe, shot on a Canon 5D, natural light by the window, warm and inviting.
When you use this formula, you’re giving the AI a full roadmap.
Notice how every piece tells the model exactly what to do: who to show, what they’re doing, where they are, how the shot should look, what lighting to use, and the final mood.
The result isn’t random — it’s intentional.
The beauty of this formula is that you can swap out parts without breaking the whole.
Change the environment to abusy street at night, and the AI adjusts.
Change the art style to oil painting, and you’ll get a completely different aesthetic while keeping the same subject and action.
This is the difference between crossing your fingers and actually controlling the output.
Step-by-Step Example Walkthrough
Let’s take a full prompt and see how it works in action:
A young woman with freckles, smiling thoughtfully, sitting in a cozy café, shot on a Canon 5D, natural light by the window, warm and inviting.
This follows the formula perfectly. The subject is clear, the action is defined, the environment is specific, and the art style, lighting, and details round it out.
Now let’s tweak just one element — the art style. Change shot on a Canon 5D to oil painting on canvas.
The result instantly shifts from a photorealistic image to something more artistic, even though the subject, pose, and environment stay the same.
Or let’s switch the lighting. Replace natural light with dramatic neon lighting.
Suddenly, the cozy cafe transforms into a bold, futuristic scene, all because of one word swap.
That’s the beauty of the formula — you don’t need to rewrite the whole thing. You can experiment with tiny changes, test variations, and iterate until you get exactly the mood or style you imagined.
The Nano Banana Editing Formula
Image generation is great for starting fresh, but what if you already have a picture and just want to tweak it?
That’s where Nano Banana’s editing formula comes in.
The formula is simple:
Action/Change + Specific Element + Desired Style/Effect + Relevant Details
Here’s why it works.
- Action/Change: Start with a strong verb so the AI knows exactly what to do. The five best ones are: Add, Change, Make, Remove, Replace.
- Specific Element: Point to the part of the image you want adjusted. Don’t just say the picture — say the sky, the woman’s jacket, or the background tree.
- Desired Style/Effect: Tell the AI how the change should look.
- Relevant Details: Add finishing touches like photorealistic, cinematic, or minimalist to nail the output.
Let’s test it:
Prompt: Replace the sky with a light blue sky and fluffy white clouds, photorealistic.
Notice how each piece is clear. The action word is replace. The element is the sky.
The effect is light blue with fluffy clouds. And the detail is photorealistic. The AI doesn’t have to guess — it just follows your instructions.
Specificity is the secret here. If you’re vague, like make it better, the AI will interpret it in unpredictable ways.
But when you pinpoint exactly what to change, the results are sharp, consistent, and closer to what you imagined.
Clothing & Complex Edits Without Breaking Faces
One of the biggest headaches with AI editing is this: you try to change someone’s outfit, and suddenly their face looks completely different.
Instead of a quick wardrobe swap, you end up with a stranger in the image.
The trick to avoiding this mess is being specific — especially with the action word replace.
If you just say change clothes, Nano Banana may guess and over-correct. But if you spell it out, you keep the face intact.
For example:
Replace the man’s white shirt with a black t-shirt, photorealistic.
Notice how direct that is.
You’re telling the AI exactly what to swap, nothing more.
The result? Same person, same face, just a new outfit.
Now let’s raise the difficulty. Imagine two people in the picture, and you only want to edit one of them.
If you’re vague, both may change. Instead, narrow it down:
Replace the front woman’s black jacket with a red dress, photorealistic.
Even with multiple subjects, Nano Banana follows your lead when you’re precise.
Tips for consistency:
- Always start with an action word (replace, remove, etc.).
- Call out the exact item and color.
- Add details like same face or photorealistic if you want to lock the realism.
Once you get into the habit, outfit edits stop breaking faces — and start looking natural.
Common Mistakes to Avoid
Even with formulas, it’s easy to slip up. Here are the pitfalls to watch out for:
- Being vague: Prompts like make it better give the AI too much freedom. Be specific.
- Skipping action words: Without replace, remove, add, or change, the AI won’t know what move to make.
- Overloading details: Stuffing the prompt with every idea at once only confuses the model. Keep it focused.
- Not pointing to the right element: If there are two people in the frame, say the front woman instead of just the woman.
Avoid these mistakes, and your prompts will instantly become sharper and more reliable.
Conclusion
At this point, you know the two key formulas that make Nano Banana click: the image generation formula for creating from scratch and the editing formula for making precise changes.
With these, you’re no longer guessing — you’re in control.
The best way to master prompting is simple: practice.
Swap out one detail at a time, test variations, and notice how even small changes shift the output. The more you experiment, the more natural prompt writing will feel.