aggiornamento (update):

fixed the arm (I think. Figured out it was the shoulder was to much on the left)
about feet, I changed their position so that the bottom is no more visible.
I changed the lighting and, hopefully, fixed the butt (thanks Larwick).
I also made the outlines on the leg more continuous, and I find it makes it really better, thank you Rydyn.
about the hair, i like them this way, sorry if it is too much anime-inspired...

also the craters are more defined now, I think.
Opinions?
thanks everybody.