that guitar shot is really neat! very good perspective and the depth-of-field works very well. the lighting is killer too
the first two, to me, are kind of bland. nothing there that really inspires or makes me say "cool"
the candle shot has definite potential. if it was a little brighter and vivid, that would be good. but having a flame lit on it would be good. even better might be a flame that was just extinguished so a nice little trail of smoke is coming off of the wick
just my $.02