Really not fond of the angles here; the lighting is good in #1, but in #2 & 3 I suspect you light was too high, and his eyes are rather dark, and especially in #2 his shirt is lost in the background. What I don't get here is any sense of who he is; what his interests are, etc. One of the goals in senior pictures (IMO) is to capture personality, and record "who" the person was; if he's a sports guy, show him in his uniform(s), or with ball, hockey-stick, etc. Show him at favorite locations, maybe with his car, etc. Since it's your brother, you've got no excuse for not going back and shooting some more!