This photo pose is a frame shot. They usually use this shit so it can tell you more about the picture and can sometimes tell a story. The fact that he is sat at the top of the stairs and he is in the top third of the picture also gives him power and he is sat in a manly way.
This is an off centre shot. You usually use this shot to make someone look powerful and distant. By making the model look away it gives a sense of calm. This also works with the rule of thirds as he is in the first third, vertically and his face is in the tiop third of the picture giving him power. I think that this picture would have looked professional if i had him in focus and the background blurred.
This photo gives a sense of rebelion because he is looking straight at the camera with the camera tilting up which can make him look powerful and also quite intimidating. He looks masculine because he has his hands in his pockets with his legs slightly apart. To improve this picture i would have got the whole of him in the shot.
Light and darkness as well as motion can effect the type of picture you get, you can use reflectors to change the effect you get with lighting. The rule of thirds needs to be thought about when taking the picture as it can effect what message you are trying to get across.
