I have to agree with the other comments, you should try and pass the photo on the neat image software to take that noise from the background and more focus would be better but the ideia is simply great i like the colors. The blue guitar sticks out just great.
Looks like there is some camera shakes going on? mabey a use of tripod would have been better? I think the last guitar could also bee straight as the others, good lighting thoush with the dark on the top, but the harsh shadows from it are a little disturbing, Good luck :)