beautiful. I love the combination of textures and shadow. While some people have noted her being too skinny, all I see is a beautiful shape and good posing. She's got enough shape to her legs and arms to make it obvious she's not anorexic or anything and honestly I think the definition of the ribs makes the photo that much more intense and wonderful.
Like it has already been said: First thought was : Oh my god she should eat :/ but I know it from myself, when you stretch yourself you can look this skinny. And her legs show, that she is not too skinny And the picture itself is really awesome! Kinda scary and desperate, but thats the feeling you shall get, I think. And I really like it :> (I hope I can make myslef clear, I'm german and my english is not that good ^^")