I got 12/18 on faces as an American-born Caucasian living in Japan for over 10 years. Since the subjects were photographed in New York City (and from the other comments, at least a decade ago), cues from fashion and makeup only helped me get about 4 of them, another 6 had pretty strong ethnic features. Of the remaining 8, it was a bit of a tossup and I did worse than guessing, getting only 2 correct.

13/18 on food. Even with a lot of the same general types of food, the presentation and specific ingredients made a lot of them somewhat simple. I got tripped up on a few, though, where I overthought it ("a Japanese X is usually not like this") or ones where it was really a tossup for me between Chinese and Korean since I'm less familiar with those foods.