Cool jeans.
Nice vertical framing.

Good choice of the subject, but to my humble opinion, the suit of the player take too much place. I'd crop the focus more on the instrument. I like the expression of the player.

If the camera weren't shaking, this would be top notch. I like this a lot (and I'm assuming that the lack of sharpness is due to camera movement rather than focus or subject movement).
What kind of event was this?

Nice image of the musician concentated and playing - would have been even better with a sharper focus on the violin too!

Definately relevant and good composition. Perhaps just a touch soft on focus.