The twisting waist have a little bit strange in the 1st pic. Becareful of the chest & waist when u rotate them. The stomach is easy to distort.
I give u some comments from head to tail

:
The hair like a plastic & colour is flat (pure purple), the specular & colour map need to be more detail, more different colour.
I can't see the face very clear... the mouth need some bump on it. A good bump map can make a realistic mouth.
The body like plastic too. Cause there have no vareity of the colour, bump & specular. I know it's hard to do a human skin. I'm trying in home too, haha.
The clothes is very good. If u have a little dirty on it, i think it's better. And don't forget the specular map on the clothes. I see the specular is very smooth here.
work hard, I believe u can do it better!