Touch more light on the tuning pegs, lose the capo and the pick(or move the capo to the fretboard), and work on the background to get rid of that diagonal line in the middle of the fretboard.
Try putting a piece of plexiglas under the guitar.. you can get a real nice shadowed reflection under it.
It's a pretty nice look, but I agree with bdavison advice about the neck and the background line. You should post some pics of your DIY softbox. I'm always interested to see how people put together their shots.