These are pretty good for a first attempt.
I generally prefer B&W for indoor gigs where the light is poor to prevent red faces. If the colour doesn't add anything, leave it out. I've never had much success trying to remove red selectively to give natural-looking skin tones. The data simply isn't there, and faces end up looking rather insipid, and standing out more than they would if things were just left alone.
The first three could do with a gentle crop to get rid of the bits n pieces around the edge of the frame - either go for a wide, full band shot, or concentrate on one element, rather than an awkward halfway house. I'm guessing, but does your lens stop at 28mm-equiv (18mm on crop)? Going to 24mm (16mm on crop) can really add a nice bit of wideness to whole band shots. But that might mean a new lens purchase
The shutter speed seems a bit slow, judging from the movement in the guitarist's hand. This might be a problem for capturing those iconic jump-in-the-air shots or anything of the drummer. Try 1/160 as a minimum, faster if they're jumping around like crazy.
Top two, the head is dead centre in the frame - try to frame so the singer is looking into negative space, and looks better head on the higher of the two vertical rule-of-thirds lines.
That copyright notice is badly-placed. It doesn't do you or the band any favours to obscure the singer's face like that. I can't really read the URL anyway. If someone wants to "steal" your photos, at this stage of the game it's a compliment, and they might just commission you for their next shoot on the strength of it. No professional would let their shots out the door with a watermark right across the singer's face.
But overall, good effort.
