[decafninja]

As some other posters have said, it’s the “accessories” that often give you a clue. Clothes, makeup, hairstyle, etc.

Also, Asians in their native countries are more distinctive vs. say, fully “Americanized” Asian Americans who I feel are a separate category that is more homogenous with each other than their country or ethnicity.

Another point I’ve observed more recently is that Korea and some parts of the Sinosphere are converging in aesthetics. Japan still seems to be doing its own thing. Though culturally I’d say Japan and Korea nonetheless share the most similarities.