I like some subtle differences between Asuna's and Kizmel's faces: Kizmel having a sharper nose, more pronounced lips with some gloss, pointier chin, etc that all show the difference in apparent age and possibly race. (Well, not sure if her face was created to look like a particular real-life race of human, but you get the point.) It's actually way more pronounced in the other official art where Asuna is holding Kizmel's hand while asking her for something. Anyway I appreciate the attention to such very subtle details.