C&C per req:
1. Ahhhh... the mandatory brick-wall shot!

Technically, it's not bad, exposure and focus are okay, lighting is a little flat, but not bad. The two points that really kill this for me are (1) that he looks totally dis-interested and (2) that you've cropped his arms. Cropping limbs is fine IF you have to, but NEVER crop along a lateral axis (as you have here) or at/near/through a joint.
2. I see a lot of this sort of shot, and to be honest, I don't really "get it"; they could be anyone's legs, but that's just a personal taste thing. Image wise, the feet are too close to the bottom of the frame (always leave major elements in the image a little breathing room) and you've got wayyy too much DoF. Use long glass and large apertures to create selective focus and isolate subjects from the background.
3. This would cute had you shot in portrait orientation (IMO, all three would have been improved by that), and not cropped so tightly. The skin on his hands and cheek also seems a little hot. Consider using a fill flash to better balance the subject against ambient.
Just my $00.02 worth - your mileage may vary.
~John