Shoot the reference before you open the generator
The model edits from your photo, so your photo sets the ceiling. A blurry label stays blurry in a marble bathroom. A cap that was cropped out of frame comes back as whatever cap the model invents. Ten minutes with a phone by a window does more for the final images than any prompt.
Put the product on a plain surface, switch off the ceiling lights and shoot with daylight coming from one side. Fill most of the frame but leave a little space on every edge. If the back or the base matters (an ingredients panel, a hidden zip), photograph it separately. The model can’t know what it has never seen, and it will guess with total confidence.