Comparing a player made image to an original image

I am creating a game where the player is making copies of famous paintings and be graded on them from 1-100. Is there any method of making this work?

You would need to make a script that gets each pixels color value for the famous image and the drawn one and compares them. Then it would find the percentage of pixels that match and gives you a score based off of that data. I don’t know how experienced you are but I probably couldn’t do that by myself.