I think their\'s not enougth contrast. What is done so far is well done but you could add more shading and highlighting. For example, the underside of the boobs is the same color as the top, the area where the two legs join should be uch darker, inside of the arm same color as the top of the arm... ect. and the wings just look like one layer was applied.
Like I said, what as been done so far is good, but in my opinion it could use more work.