Augh... Linkin Park I am not a fan. But nvm that ^_^
By keeping the lines and background simple, as well as covering her face, you've made her pose the focus of this image. And it is a very effective pose. It conveys her loneliness, sadness and regret perfectly. The monochrome colour scheme also works well with this.
You've got the anatomy down pretty well, I'm impressed. I'd just point out one minor thing: beneath her breasts, her rib cage would still give her chest a slight curvature, so it wouldn't be straight up and down. Oh! And as a skinny girl, can I just say that it's nice to see small breasts being represented in anime art every now and then? lol
Yeah, sometimes simple is best. This is a good example.