The lighting really lets this dowm - the flash shadow is too noticable. Either off camera flash, a bounce off a reflector, or a softbox (white linen diffuser) might help
i'm no good at studio shots, but this seems flat to me. If i knew much about lights id give more specific suggestions than this- but it seems you need them, and perhaps a less textured and softer backdrop.
The pose looks uncomfortable and the facial expression is pretty uninspired. I think it would have been better with a different choice of location. The interior wall and the resulting shadows hurt the shot for me.
the biggest flaw I would see with this, it is too obviously staged. Had this been in a location, a setting, it would have more pop. Also, the dress and the hair seem to be blown in opposite directions.
...Not quite. She is pleasant on the eyes, however. Lighting is rather harsh and there is a stair-step artifact introduced with overzealous edge sharpening.