The gesture seems a little awkward, but the way the head, the limbs, muscles and everything are drawn are realistic. As for Hector's head, I'm pretty sure she chose the Heroic figure over the Normal figure. Meaning that instead of using the 1/7 proportion ratio that is often used in art to draw the body, she used the 1/8,5 ratio instead. The characters drawn with this ratio look taller and their head a bit small compared with their shoulders and rest of the body. It's something that was already used in arts,by Parmigianino to be more specific.So even though it looks weird, it was used by many painters before, and on the contrary it shows how much she knows about the art of drawing the human figure.
About Amano's art, I find that he alters the body more than Kojima. And his drawings seem unfinished.Kojima's drawing are more academic and seem more solid. Not to mention how much details she puts on them. I'm surprised how good she's at drawing nudes.