Fairly standard shot. There are a few distracting elements; His feet are cropped off, the neon sign and towel in the background (shallower DOF might have helped here?), and the fact he's not actually playing the guitar. Nice attempt though.
Composition doesn't feel balanced, and it's usually a mistake when words in the background are accidentally obscured. I'd have waited for him to look to his left, then cropped tight so he was against the left hand edge of the frame. I don't like the face that half a Les Paul is visible in the background... did you want it as part of the composition or not? White balance seems a little on the blue side.
Nice clear image here. Exposure looks good, good candid expression however I am not too sure about the Amber Rock sign directly behind the subjects head. A side view may have been better here.