I had some sparetime today, so I did a couple a small but effective changes to the image.
I changed the floor/ground texture.
Added real holes to the wall, and made some slight changes to the bumpmap (the area around the holes)
Added some geometry stuff to the wall too.
Made the texture for the neck look more brownish like the original.
Changed the material for the body slightly.
But the guitar looks too light because it reflects the white background.
I have to find a way get some better reflections and still keep this lighting (sun+sky and most env maps give blue lighting).
I also found out that some of the parts (plastic around pickups and stuff) is the wrong material. It should be the plastic material, and not the same material as the body.
I hope I'll find some time tomorrow to work on it.
EDIT: Oh, and it still looks like it's flying, but it is actually touching the ground.
Ill have to find a way to fix that too. ^^