I think it's that TY is very expressive. (And yeah, that lighting in this image is outstanding.)

But her look is not a realistic look. It's a quite a long way in the direction of manga or anime (tho I'm sure a real manga person would tell me that manga isn't anime, and vice versa). There's a fair amount of stylization/exaggeration - most noticeably with the eyes, but also with the overall head/facial shape.

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