One of my friends playing in his band last Saturday night.
C&C always appreciated.
I'll take a crack at it...
Well, it's an okay photo, well exposed, but not really compelling. If it's a shot made for him or his friends, it'll work, but for me it doesn't really have any 'fire.' It looks like he's looking at someone between songs, like he's waiting for a cue for what song is next. He doesn't really appear to be playing, and isn't showing any emotion. I have no idea of the venue... is it a rehearsal in a garage or living room, is it in the studio, or is it in a club or other live gig?
Maybe (if he's a singer, too) a shot of him belting out some vocals, or gutting out some lead licks where his expression and posture would draw the viewer into the picture, and make him/her feel something. I'd prefer a crop where the entire guitar was in the frame, and not cut off.
Bottom line for me: It doesn't tell me a story.
Check your other shots, you may already have some like that...and keep working at it... lot's of potential mixed with lots of practice and feedback = success.