CustomGPT picture generation issue

Hi, I am having trouble with picture generation in my customGPT.

I fed the customGPT an image that shows several items and I instructed the chatbot to create an image based off of the prompt only using the image I gave it. For some reason, this doesn’t work, and no matter what I say ChatGPT just “does whatever it wants” and generates random stuff. Is there anything I can do about this?