I like that you added the metallic necklace, it makes the portrait stand out from similiar fashion portratis. Her hair is beautifully done and captured on camera as well, and the dark background colour combined with her dark makeup and clothes creates a great mood. Of course, the model and her pose is gorgeous!
You turned a soft and sensuous picture into one with an edge with the large, shiny choker on your model. Turned from just another soft, fuzzy beauty shot into one that really poses another scenario in the mind. Excellent work of art.