I understand now

The first thing you notice is her wonderful drawn expression.
She really looks sad, and her eye brows fits together with her eyes. The mouth looks as if its "clenched"
There is also good lightning and colour on her hair

Backgrounds are always hard to draw(i know, I always fail at them). Its not lightned up so the girl comes better into focus. But I think you should look a little at the floor? In one angle it almost looks like a painting but in another a big room.

Lovely picture, but try to work more on the perspective of the backgrounds and it will look even better <img src="e.deviantart.net/emoticons/s/s…" width="15" height="15" alt="" title=" (Smile)"/>