This creation could be used as a lesson in the use of light and shadow, or as I was taught, the use of light and "non-light". Only the boundary between the two reveals shape and depth, and this illustrates that concept precisely. Further, this image demonstrates that it is not what is concealed that creates the erotic, but that which is revealed.
The only criticism I might offer is that I long to catch a glimpse, a notion, of this woman's hand or fingers. Her arm leads the eye up into...nothing. In this case, it does not create mystery, but emptiness. Much like a melody that is not resolved.