Most people prompt image models like this: “Make this product photo look more professional.” This approach does the opposite. It tells the model exactly what it can’t touch, and it works much better.
Ahoy, Captain YAR here. A prompt structure from r/PromptEngineering caught my eye this week, and it fixes a problem I see all the time with AI image edits.
The Key Idea
Vague prompts produce images that look great at first glance and quietly break the details that matter. The label shifts. The cap changes shape. The colors drift. Sometimes the model invents details that were never on the product.
The fix is to split your prompt into two jobs: what the model is allowed to change, and what it must leave alone.
The structure has five parts:
Reference → Job → What can change → What must stay unchanged → Review criteria
Old Way vs. New Way
The old way: “Make this product image look premium.”
The model has to guess what “premium” means. Sometimes its guess is to redesign the exact thing you wanted to keep. You get a polished image of a product that no longer matches the one you sell.
The new way: Give the model a fenced-off playground.
Say you have a real photo of a reusable bottle. The shape, cap, label, logo placement and proportions are all correct. Only the background and lighting are weak. Your prompt looks like this:
Use the attached photo as the sole reference for the product.
Create one square studio image of that same product on a warm cream background.
Preserve its silhouette, cap, seams, proportions, color, visible wording and logo placement.
Show the complete product upright with soft light from the upper left and a natural contact shadow.
Remove unrelated background objects.
Do not add accessories, claims or additional labels.
Look at what that prompt does. It gives the model two lists:
- 🎨 Can change: background, lighting, presentation, shadow
- 🔒 Locked: product shape, label, cap, wording, logo placement, proportions
Nothing is left for the model to interpret. It knows where it has freedom and where it doesn’t.
Practical Steps
- Name your reference. Tell the model the attached photo is the sole source of truth for the product. This stops it from borrowing details from its own idea of what a bottle looks like.
- State one clear job. “Create one square studio image on a warm cream background” beats “make it better” every time.
- List what can change. Background, lighting, shadow, presentation. Keep it short and specific.
- List what is locked. Be concrete. Silhouette, cap, seams, color, wording, logo placement, proportions. If you care about it, write it down.
- Add exclusions. “Do not add accessories, claims or additional labels.” Models love to add extras, so say no up front.
- Define the review. Know what you will check in the result before it arrives: does the label match, are the proportions right, is anything new in the frame?
The Second Move: Change Only X
Here is the part I like most. Say the first result is mostly right, but the lighting is off. Don’t regenerate the whole image. Run a second, narrow prompt:
Edit the approved image.
Change only the lighting to a larger and softer source from the upper left.
Reduce the bright reflection on the product body.
Keep the product, label, cap, background color, camera angle, scale, position and square composition unchanged.
Do not add or remove objects.
“Change only X” is one of the most useful patterns in image prompting. It lowers the odds that fixing one problem creates three new ones. You lock in the parts you already approved, then move one dial at a time.
Where Else This Works
The same logic applies well beyond product shots:
- 📦 Product photos
- 🧹 Background cleanup
- Pinterest images and thumbnails
- Ads with text and campaign variations
- Resizing and reformatting, plus multi-reference prompts
The Mistake to Avoid
The biggest trap is cramming everything into one giant instruction. Background, lighting, composition, typography, product details and style all get mixed together. The output can look polished and still be wrong. Small, separated edits are easier to check and easier to fix.
Your Turn
Take one image you have been fighting with and rewrite the prompt in the five-part structure. Then fix any leftover issue with a single “change only” edit. Try it once and you will see the difference.
I’m curious how you work: do you get better results from one detailed prompt, or from smaller edits where you change one thing at a time? Tell me in the comments!
A Nano Banana 2.1 prompt structure that works much better than “make this product photo look professional”
by u/No_Appeal_5223 in PromptEngineering