I don't see any excessive thinness everyone complains about. I've looked at your other photos of her - she's slim and tall, and that's just in her body type. Her legs and arms are nice, too - not bones covered with skin (I've seen "too thin" girls to compare to.) Plus, don't think I'll be wrong saying she pulls her stomach in a bit - it naturally emphasized ribcage, and makes a person look really thin.
She looks very graceful, and I do agree with two previous comparisons to Uma Thurman and Madonna. And finally, as to the shot itself, the concept is wonderful. Apart from the light's "clothing" effect, I love the way her hair glow.