Honest critique?
Your son looks uncomfortable, as he probably was, with his parent photographing him. Teens are very hard to capture naturally, especially boys.
#1 - Points for trying the frame and getting the hair light, but I don't think it works. His expression is more 'surprised' than anything else.
#2 - Looks a bit dorky. I'm assuming he has the hockey stick because he plays? Then why at a rail track? Lots of confusing lines going on.
#3 - Sorry - doesn't work. Blurry face is just a distraction.
#4 - Could have been a nice shot. But that leg-spread - I dunno. Once again, looks uncomfortable and awkward.
#5 - Best of the lot, in my opinion. Even then, it is more a snapshot than anything else. However - his pose and posture looks comfortable.
#6 - Looks contrived, and colours do not work too well.
Unrequested advice:
If someone is feeling awkward about a shoot, it will show. There are ways around it. Taking a friend, perhaps, and playing them off against each other.
Look to your backgrounds vs foregrounds, in relation to lines, angles, colours and contrasts. look at #4 - he has a line going through his head.
If your aim is to show an 'environmental portrait - that is, the subject around his usual items (like the hockey stick), try and do it somewhere relative, or it will look out of place.