overall this piece is absolutely gorgeous. the colours work perfectly and they stand out really well despite the lack of range in tones. my main critiques are on anatomy.

because of the shadow on the neck that doesn't start near the jawline, i think the viewer is automatically predisposed to thinking the body will be an over the shoulder shot, given that the size of the image and the general direction of the eye forces the viewer to read the image from top to bottom . so the view of the chest comes as a little bit of a surprise. the closest shoulder seems a little flat and stunted and the accompanying breast in turn seems a little low. i think that's because the nipple is turned toward the viewer too far, giving the illusion that the body is flattening out toward us. the far shoulder also seems a little bit on the round and low side.

the face, though, is rendered with absolute perfection. so good job on that. glad to see a new piece by you. :]