Hi Mike, I have been looking at this repeatedly and something was bothering me, then I remembered seeing your reference here:
http://forum.portraitartist.com/show...0&goto=newpost, so I looked at the two together...just some thoughts for what they are worth.
First, I too love how you handled the highlights on her chest, but I think you missed an opportunity to add a lot more seductiveness to this lovely lady by decreasing the shadow on her face so much, maybe to try and compensate for photographic reference. If you look closely at your reference the shadow on her left forehead is also extended to the right side of her face with a little more warmth from the check towards the chin. By lessening this shadow, I think you brightened up her chin a lot, decreasing the fullness of her lips, they could be much lusher. Lightening this shadow has also caused you to brighten the whites in her eyes losing some of the mystery there.
If the shadow continues down, notice the value in her neck vs. her cheek: you have them close now where the bright highlight on the left of her neck, really darkens the right side. This will pop her chin out more too.
There is a beautiful highlight that you have captured on the crown of her head, you could take that even a step further doing a nice fade with your background. Notice that the left cheek hair highlight is the just about the same up near the crown on the right of her head, but notice the change as it gets down to her neck on the right.
Sorry for all these nits, but everyone gave you great technical advise, so I thought I'd just be picky. I think you have the eyes, just need a tad bit more drama!
Of course a young man serving blender beverages in the background would be nice - knowing the orgin of the photo!