Don't sell your self short there man, those are definitely good quality shots, not a whole lot to critique besides smalls aspects like, the pictures "some dude" personal preference I would of liked to see the picture with the mic stand in it rather then the microphone just popping out mid photo.
The first matt vinson looks a little blurry (could just be me),
The feet shot I would of moved over a bit so that stool was more out of the shot.
Other then that damn good job. (those are mostly preferences too)