Interesting concept.
The pose is pretty solid and the face looks really good, but you could work a bit on capturing the volume of the body.
The shadows suggest the shapes of the body fairly accurately, but you might want to make the bands in the middle section taper of a bit more sharply to follow the boxy shape of the rib cage a bit more.
The nipple should also be placed a bit lower on the breast. (Imagine the breast as a teardrop shape where the nipple is roughly placed on the widest part, pointing slightly down and out.)
Keep up the good work!
