A couple of things strike me; first and foremost, her face is significantly under-exposed, and as Raj mentions, there's a lack of an 'anchor'. A couple of reasons for this: One is that you have a large, very bright area in the background, and the human eye is always more attracted to bright than dark, and two the sharply focused, geomtetric pattern on her sweater... the human eye always wants to follow lines. Both of these elements combine to produce an image where the viewer is being dragged everywhere but where he should be looking.
If you increased the exposure on her face, burned the background, and applied some subtle blur to her sweeater, you'd have a whole new image.