I feel like there isn't enough contrast in your lighting, and as a result the light doesn't sculpt her very well. I would also recommend spending some extra time during the shoot in order to make sure the hair looks good. She would look much better if her hair was a little more under control. I would also try and get softer hand poses; the hand near her face looks tense, and you want it to look soft and elegant, especially if you're trying to showcase the model's beauty.