itch.io

It's a pretty scuffed system, but I'll give a quick rundown: 

Every photo has another texture linked to it, which I'll call a "trait map". This way we can assign each pixel in the photo a "trait", eg. all the fish pixels have the "fish" trait linked to it. (think something like a normal map, but instead of each pixel representing a normal vector, it just represents a "trait")

Cutting and pasting other photos will also bring their respective "traits" to the new photo.

Then we just run a quick algorithm to count the amount of "trait pixels", and add feedback to the feedback section depending on how much of a certain trait is in the photo!