#1. I like the perspective, but it could be better by levelling the image just a tad clockwise... It's ever so slightly off the horizon. Also just a tad more light on the body of the guitar to cue us as to what it is would make it more effective.
#3. Again, just a kiss more light on the body.
#5. Love the specular highlight, but the darkness on the rest of the chrome suggest to me that the photo is underexposed.
Overall, though, I'm not really digging the purple tint.
I havent got any critique as im really not qualified to do that but just wanted to say I was trying to get images like these of my guitar a few days ago but got no where near as good as what you've done, these are the sort of images i wanted to capture, i really like them although like the other posters not keen on he purple tint.