Lighting/tone and shadows are all very good.... the pure white in her eye is a nice contrast to the tones in the rest of her body... she is a beautiful model with lovely eyes/skin - I would like to have seen her look directly into the camera, and cropped tighter on the knee and arm - her shoulders are very lovely and more emphasis on them would have made this shot very exciting.
Nice composition, but would crop a little more on the left to bring her eye into where the upper and left third lines intersect. I love the way the shadows play across her face, shoulder, and knee.