Black's bag height isn't that strange. O_o Looking at the
official art, Black's messenger bag seems to be at the height I've seen many people wear their bags. If anything, it just seems strange that it's right under his arm, but at the same time, considering how small his bag is, it seems perfectly fine for it to be in that general area.
White's shorts are quite... Strange. They're short-shorts, sure, but the wing designs on the end literally seem like a parody of torn jeans girls often wear. If it is a joke on that, then GF's quite stealthy with their visual puns. Really, White appears as if she's traveling in the summer time, considering while Black has a sweater, White's wearing a sleeve-less black jacket, and actually shows the amount of skin. Her hair isn't that weird in my opinion, it looks fine, considering the other hair styles used within the series (Here's looking at you girls, Gardenia, Fantina, and Greta)