Thanks for all the answers, here are the results for the survey in case you were wondering how you did!
Edit: People working in CS or a related field have a 9.59 avg score while the people that aren’t have a 9.61 avg.
People that have used AI image generators before got a 9.70 avg, while people that haven’t have a 9.39 avg score.
Edit 2: The data has slightly changed! Over 1,000 people have submitted results since posting this image, check the dataset to see live results. Be aware that many people saw the image and comments before submitting, so they've gotten spoiled on some results, which may be leading to a higher average recently: https://docs.google.com/spreadsheets/d/1MkuZG2MiGj-77PGkuCAM3Btb1_Lb4TFEx8tTZKiOoYI
Wow, what a result. Slight right skew but almost normally distributed around the exact expected value for pure guessing.
Assuming there were 10 examples in each class anyway.
It would be really cool to follow up by giving some sort of training on how to tell, if indeed such training exists, then retest to see if people get better.
Imo, 3,17,18 were obviously AI imo (based on what I've seen from AI art generators in the past*). But whatever original art those are based on, I'd probably also flag as obviously AI. The rest I was basically guessing at random. Especially the sketches.
*I never used AI generators myself, but I've seen others do it on stream. Curious how many others like me are raising the average for the "people that haven't used AI image generators" before.
I was legitimately surprised by the man on a bench being human-made. His ankle is so thin! The woman in a bar/restaurant also surprised me because of her tiny finger.