Most label mockups look great on a screen and fall apart the moment they get printed. The text gets too thin to read, the pattern turns into grey mush, and the illustration that looked charming at full size looks like a smudge on a bottle. If you are using an AI image generator to make label art, the fix is not a better model. It is a better prompt, written with the print process in mind.
Start with the finished size, not the idea
Before you type anything, decide the real world size of the label. A jam jar label is roughly 6cm tall. A wine bottle label is 10cm. A beer can wrap is closer to 8cm with a 12cm circumference. Those numbers change everything about what you can put on it.
Put the size in the prompt as a proportion rather than a measurement, because models handle relative scale better than absolute numbers. Something like "art for a small jar label, chunky shapes readable at 6cm" tells the model more than "high resolution label." You are asking it for boldness, and boldness is a decision you can request.
The single most useful phrase I keep coming back to is "few large shapes, no fine detail." It sounds restrictive. It produces labels that actually work.
Think in terms of what wraps
A label is not a flat poster. If it goes on a curved bottle, the left and right thirds of the design will be bent away from the viewer at steep angles. Anything important placed there is effectively hidden.
This is why centred, symmetrical layouts dominate product packaging. Not because designers lack imagination, but because a centred composition is the only one that reads when the sides fold away. Prompt for centred compositions when you know the label wraps. Ask for "a single central emblem with quiet margins" and you get something you can rotate around a bottle without losing the point.
For cans, the situation is different. The wrap is continuous, so a repeating edge-to-edge pattern can work. Ask for "a tileable pattern with no obvious seam" and then check the seam yourself. Models will happily claim a pattern repeats cleanly while leaving a visible join.
Build text space into the request instead of adding it later
The most common label mistake is generating a beautiful piece of art and then trying to squeeze the product name on top of it. The art competes with the type and both lose.
Prompt for the empty space explicitly. "A central illustration occupying the top two thirds, flat untextured area at the bottom for type" is a legitimate thing to ask for, and models usually comply. That flat area is worth more than any amount of decorative detail, because it is where the product name, weight, and ingredients will live.
Leave more room than you think you need. Type needs breathing space above and below, and legal text at the bottom of a label is tiny. A generous flat panel stops you from shrinking the font into unreadability.
Choose a limited colour count on purpose
Labels are often printed in two or three spot colours, and screen printing on glass does not do gentle gradients well. Even if you are printing digitally, a limited palette reads better at small sizes because the shapes stay distinct.
Ask for a specific number of colours. "Three-colour palette, deep green, cream, and a warm rust" gives you a design you could actually send to a printer. It also makes the label look deliberate rather than generated, which is the bigger win.
Be careful with very light colours on very dark ones. Thin cream lines on a black background look sharp on a monitor and disappear once printed on a curved surface under shop lighting. If you want contrast, ask for large areas of each colour, not hairlines.
Test the design at real size before you commit
Generate at whatever size the tool gives you, then shrink the image down to the actual label dimensions on your screen and look at it from about a metre away. You will immediately see what survives.
If the illustration turns into a blob, you asked for too much detail. If the pattern becomes noise, you asked for too many small shapes. If the composition feels lopsided when you imagine it on a bottle, it was not centred enough. Each of those is a prompt fix, not a redesign.
Run this test two or three times and your prompts will start producing label-ready art on the first attempt. That is the whole trick: you are not trying to get a nice picture out of the generator, you are trying to get a picture that still works after it has been printed small, wrapped around a curve, and viewed from across a shop.