As i am new to this world, the most prominent one is their eyes. I dont know how but their eye sizes fluctuates a lot, I know there are lenses and what not but when they are wearing them their eyes naturally look bigger and sometimes wider too compared to when they don't and in their live media photos. It's as if their own cameramen enlarge their eyes in post production.
I have seen many asian and non asian acts and their uses of contact but koreans (idols) have most defined difference in their with makeup and without makeup looks.
If this sounds stupid to youz i don't know much about the industry and this is few things I noticed. 
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