Wel, on the second one, you should change the flip-flops to high heels or get rid of the way shes balancing on her toes like that, it looks awkward. at least put one foot down flat.
the shading on her skirt looks weird too, you might wanna change that.
On the first one, the shading on what shes wearing looks funny in general. its not too bad, but it could look better.
As for the hair on either, i can't offer much help other than rather shading the thick bands like you seem to be doing, you should make more thin strands and add more bumps on the outline so it looks like hair.
On the flip side, i like the position on both, the first especially. the clothes look great. plus i like the style.