This might have been a bit better if the frame was cropped in tighter against the portion of the guitar with curves, maybe even taking a different angle than head on (maybe from below and to the right)
the wall is not perfectly square with the camera, and it detracts from what could be a very nice formal presentation. I would also try moving the guitar away from the bottom edge of the picture just a bit. the lighting could be made more dramatic if it weren't directly above the guitar, but hit it at a 45 degree angle so it cast a shadow on the wall.
Beautiful instrument crying out for better setting up - needs lighting also to bring out its shape - has no impact full face on. If it had been leant at 50% against the wall then lit from one side and pic taken from other it would have been better instead of just a record shot.
see some of the other guitar photos in this challenge for ideas on how you could have made this more interesting: shadowy lighting, different angles, crops of select parts of the guit, etc.
This subject matter has the potential of making a nice picture. Try adding some different lighting, or perhaps a different angle to make the picture much more interesting.
I would have tried to get in a little tighter on this shot. It's in good focus but there is not a whole lot there. Maybe try it from a different perspective.
Interesting photo... I believe that you have a glare in the upper portion of the photo... If you had shot this from a little different angle, it would have taken care of the glare, introduced some more depth to the photo and accented the indentions in the side of the instrument, adding some more 'curve' to your work :)