Like Jay said, this seems very flat. The pelvic bone has no depth here. If you look at some reference, the pelvic bone is a very strong feature in women, the hips as a whole are, especially in women this thin.
I think generally this is lacking in form (as Jay mentioned) in all aspects, not just the hips. The arm seem like slightly edited cylinders, they have no weight. Don't be afraid to fill in forms too much, you can always smooth it down. Get some ref and just start hacking in some character.
But, generally a good start.
Keep at it!
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Last edited by Mayaniac; 08-04-2012 at 10:54 AM.