Start with a bright image where hair, outfit, and expression are all visible. The model does a much better job when core details are not hidden by shadows or aggressive filters.
Add a short note after the upload instead of rewriting the entire scene. Mention the emotion, background simplicity, or whether you want the result to look more like a sticker or a profile avatar.
If the result feels too generic, keep the photo the same and only change the style preset. That is usually a cleaner iteration path than rewriting the whole request.