I love the way you used the rock ridges to form leading lines for the model, and how her pose compliments the lines instead of just mimicking them (which would have been the easier way to go). Even the pattern in the bathing suit helps bring out the swirls and striations in the stone. Great job!
Hmmm....DA says I have to use more words. Okay. Here are some more -
I like the way you used warm reflected light on the model. It would have been very easy to miss with that, and have distracting shadows.