I just tried the survey and got 12/20, it's interesting looking for the details that give it away and how often that lead me to the wrong answer. Comments on each image below because I thought this was neat, hopefully I'm using spoiler tags correctly.
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Image 1 (Incorrect): I was totally 50/50 on this one, and I guessed wrong.
Image 2 (Correct): Glasses look wrong when looking closely. If he wasn't wearing glasses, I think I would've been 50/50 on this one too.
Image 3 (Correct): The most obvious AI generated one in the list.
Image 4 (Incorrect): I accidentally spoiled myself on this one by clicking on your image before the survey, but there's no way I would've guessed this was AI so I chose "No" to keep my result accurate.
Image 5 (Incorrect): I thought the shoes looked kind of odd, that was the only thing I was going off of.
Image 6 (Incorrect): I was really conflicted on this one. The floor of the boat didn't look quite right, but not necessarily in an AI way. In the end, I thought it was AI because of the random pieces of wood in the boat. That seemed like something an AI would randomly add, but I was totally wrong.
Image 7 (Correct): Eyes are clearly AI generated, and parts of the sword look off. If it wasn't for those, it would be really hard to tell.
Image 8 (Correct): The butterfly has an extra wing coming out of its back.
Image 9 (Incorrect): This was another one I was conflicted on. I chose AI because the dirt(?) right after the waterfall seemed odd, but I was wrong.
Image 10 (Incorrect): I was fairly confident in my guess. The resolution makes it hard to tell, but it looks like right horse is melting in that usual AI way, but I think that's actually supposed to be the thing that connects the horses to the cart at a second glance.
Image 11 (Correct): I couldn't imagine an AI drawing trees like that.
Image 12 (Correct): The break in the river in the middle of the image looks odd.
Image 13 (Incorrect): I was 50/50 on this one, guessed wrong.
Image 14 (Correct): This is the other one I spoiled myself on, but the highlights look super weird. I'm quite sure I would've guessed this was AI-generated regardless.
Image 15 (Correct): I didn't think an AI would generate an image with specific details like the fish bowl or Pocky that well.
Image 16 (Correct): I almost got myself thinking this was a trick question because there's no way an AI would generate something that accurate.
Image 17 (Correct): This generally looks AI generated, but the pattern on the pants was a dead giveaway.
Image 18 (Correct): The arm rest is at the same level as the chair/couch cushions?
Image 19 (Correct): I don't really have any comments on this one, it just didn't look AI generated.
Image 20 (Incorrect): This one has that AI-generated vibe, but I thought that might be intentional to make this harder. I couldn't see any other details that made it obviously AI, so I guessed it was real. Welp.
This was a fun survey, thanks for putting this together.