nice idea but cant have flash reflection like that. Bounced flash would have been much more pleasing IMHO. distracting right edge also detracts, as well as top of neck of green guitar just out of frame.
The placement of the objections in the image seems very forced. Having one of the guitars up against some of the text books with interesting lighting would be a more interesting shot. The shape and color of the acoustic guitar with the heart shaped center hole is neat and could have been highlighted better.