Photos of photos has always been a problem.

In days of old, a Polaroid photo was considered "proof of capture".

I've got a Polaroid daylab 35 plus sitting in storage somewhere (https://www.instantoptions.com/wp/faqs/daylab/). You can project a slide through it onto Polaroid film, expose it, and have the image there.

I was also able to find a company that did slide printing. It was possible to send them a digital image and they'd send you back a slide with that image... which I then used to make a Polaroid of that image.

I had a classic 600 Polaroid photo of a UFO landing.