10/20 and most of it was just guess work. It has become pretty much impossible to tell when you pick real images that are in the style of AI images, you really have to go pixel hunting to find artifacts and even that is getting difficult, when things get blurry or you get JPEG artifacts when you zoom in.

That said, there are still plenty of images AI has a very hard time creating. Anything involving real world products will always look wonky in AI, interesting framing where you don't have one object in the center is hard. Unusual aspect ratio are hard, as AI is trained on squares. Complex scenes with multiple characters rarely work. Facial expressions are hard. And generally just normal everyday photos don't really work, AI stuff always looks like people posing for a stock photo.