Same, I was looking for inconsistencies in lighting, black/white points, etc, and I think in several cases I picked an image as AI based on details that were a result of photo manipulation and not "real". I got the same score as you in the end here.

Kinda interesting, somewhat invalidated what I thought this was testing, but it's an interesting test nonetheless. I may retake this in a few days now that I know it's comparing AI to photoshop and not "reality". Would certainly need a different strategy.