What kind of lens were you using, and have you had a chance to upload anymore photos? I'd be interested in seeing some variation - these are all quite similar, close cropped on the vocalist.
These aren't high enough resolution for me to REALLY tell, but it looks just slightly like the focus is off on the first and last ones (focus on mic rather than eyes, a common problem). The composition of the first shot is pretty good, it's the only one I might actually crop farther down to get the hand on the right out of the picture. The third one is my favorite, though that may just be because it stands out the most from this set.