Interesting photo. I think I'd like it even better without the small guitar. That would leave the red curve against the red background to catch the eye.
I really like the red guitar against the red background. Especially as the white line really stands out. The small guitar though IMO is extraneouis to requirements.
I like this shot quite a bit - except I find myself wishing the small guitar were not in the frame. I'd rate it higher if it werent for that. I think you may have setup like this to help show dimension, but I feel it would add to the shot's overall feel if it were not there. nevertheless, it IS a very interesting shot.