I find the background in your first image pretty busy. Although it kind of suits the image if we saw part of his bike. Without the bike, its just a head shot of a kid. With the bike, it would add more to the story you are trying to tell.
Tecnically, it seems the face is under exposed. I do like the rim light that the sun is causing, could use a bit of fill flash..just a tad as his eyes are very dark. Sharpness is good. He could look a little less...bored.
The second image, other than showing that you can control depth of field, really doesnt do much for me. Again, a busy background that doesnt fit the scene, very random thing going on, not sure what he is giving you.
Subject aside, the composition is good, I like how the fence kind of draws my eye to his face...I just dont like the car/truck in the back