This is looking pretty nice, but the face could use a little more work. I don't know how closely you were planning on sticking to the illustration, but there's a gauntness to it right now that doesn't quite match with the rest of her body for me. I also think it would be worth the extra polygons to give the wings thickness…
Nice job so far. I'm a fan of Yamashita's work so I'm looking forward to seeing your progress on this. The actual "wings" parts look kind of small. I think she's a bit thicker in the limbs than the illustration, and maybe her legs could be longer, but other than that the shapes look pretty good. She could probably use more…