I like the first photo better, the light is nice and I like the way his body moves. But the face is maybe too dark, I don't have enough experience to tell you if you can lighten it without touching the other parts.
Maybe, if he allows you another chance to take a photo, he could take the same pose, with his skateboard on his hip...I think it would make a very natural pose.
For this kind of light, you have to spot meter on his face. ( I tell you what I've been told: I don't control yet my camera that much
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