i like the idea here. i would have liked to see more of the guitar, the red looks very cool on the left. the background could be better, it takes away from the picture
Nice and sharp at the business end. I'm not sure this meets the challenge very well. Also consider de-centralising the main interest point in your photos, they are more pleasing to the eye that way.
The flash seems a bit harsh. Might try experimenting with diffusing the light for the close up shots. I would have cropped the neck over to one side and tried to use the rule of 3rds.
Is that an ernie ball? its a decent shot but crop tighter on the top, and make it a little brighter, maybe less contrast since the wood grain is so defined.