The composition doesn't work well; her arm divides the photo in two. Above is the model's face, which is great. Below is her dress, which is blurred and distracting. And the violin, which should be a focal point, is in the corner where it is ignored. Too bad you couldn't climb a ladder to take this shot!
Nice subject and good energy in her motion. However, the lighting's kind of flat - maybe you could enhance the contrast in processing? And there seems to be a fair amount of noise. I'm guessing you were at a relatively high ISO to stop the motion as much as possible, which creates noise. If you don't have noise reduction software, the Community Version of Noiseware is free and pretty good.
I would maybe have considered a black and white for this - it would emphasise the movement rather than the colour, which - especially those circular patterns on her dress - really draw the eye strongly, and given their distortion, surely detract from the otherwise pleasing impact of that movement.