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Test Yourself: Which Faces Were Made by A.I.?
(www.nytimes.com)
This is a most excellent place for technology news and articles.
I think they purposefully picked real people with slightly odd proportions to try and throw you off, but did it a little too consistently making it easier to guess. I think with more work put into it it would be very hard to tell. It's hard to tell and this is just a quickly thrown together blog quiz.