The magic words are “die-cut sticker” plus “thick white border” — they switch the model from illustrating a scene to designing an object: bold outlines, flat shading, a single centered subject on a plain background. A dependable structure is: “Die-cut sticker of [one character or object with a personality trait], [art style], thick white border, [background color]”. One subject per sticker; two characters interacting almost always reads as clutter at sticker size.
Style keywords do the heavy lifting: kawaii, chibi, retro badge, 70s groovy, holographic foil, vinyl toy. Ask for a “plain solid background” so cutting the design out for print or a Telegram pack takes one click in any background-removal tool. All ten designs below are unedited outputs generated on BananaBanana — at $0.03 per Lite image, a full 30-sticker pack of drafts costs less than a dollar.