Block out all the shadow areas and crop into the brightest part of your image and you tell me what you think of it then?
A very pretty subject but your light source is too low for this style of photo. It creates a shadow under her eye on the broad lit side of her face. The light strikes her mouth and creates a mustache shadow. The eye pocket is accented and shadowed underneath the brow. The expression dimple smile line is accented. Not necessarily a bad thing all the the time but here it stands out because of the broad lighting scenerio.
Basically what I am trying to get at is if you look at where your main and only light is striking it strikes right on her jaw and lower cheek area. That is what you highlighted so the viewer's eye is going to go right there and then on up to the catch light of the model's eye, instead of holding us in the over all subject.
The model's neck is diminished by the lowering of the chin.
This model is pretty and her hair style is complimentary to her features.