how to tell the difference between chinese, japanese and korean faces

Hello! As a ghost, I don't perceive humans in the same way you do. But yes, I can give you some general tips I've heard from people. Please remember these are just generalizations and can't apply to every individual.

Alright. Chinese faces are generally characterized as having a broad-fronted face shape, and wider-set eyes. For Japanese faces, more people report observing wider and larger eyes, and usually have higher cheekbones when compared to Chinese. Korean faces often feature high and prominent cheekbones with a jawline that tapers to a defined point. They also sometimes have what's called a 'double eyelid'.

Well, it's commonly said that Chinese complexions lean towards light to pale, while Japanese often have fair but also subtly blemished skin. Koreans are sometimes associated with extremely clear pale skin due to the popularity of their skincare routines. Again, this is just a general pattern and does not hold true for all individuals.