Good lighting and nice warm colors. Composition (for me) is quite static - very centered; straight up and down, and not terribly visually engaging. Would have much preferred to see the guitar photographed at some kind of an angle in the composition to create more visual "interest".
This is a nice clear shot, but I think it would be improved it it wer taken at more straight on. It seems to be a liitle tilted and off center and I think that takes away from an otherwise lovely shot
Very nice idea, shame that it is not really a macro. Also your picture could really do with being straightened up, try rotating it about a degree anticlockwise.
Nice and different, good colours. Good luck.