I had some fun with this. After a while you can find a lot of clues to spot the ai picture. I looked at ca. 15 pictures and got two wrong. Then this happened: https://pasteboard.co/JFldXA6.png
Sorry for posting a picture - the picture shows one normal face and one not quite so normal. Guess which is the real face : )
Got 10/10 correct. These are pretty easy to spot by looking for the artifacts around the hair. Similar to how its easy to spot the fake background blur in "portrait" iphone pictures.
But really this is just spotting to see if the picture in general was manipulated. If i'm lookin at the actual faces it becomes much trickier.