I really *REALLY* like 4, 5, 6, although in #5, that hand being cropped bugs me slightly. Completely off might be better than partial, since the other hand is fisted, and that difference is a little odd.
In #1, cool hair on the kid, but something hinky about the processing on the face. His right eye too white? Face is dodged maybe a bit too much. Would like just a little more ground in front of his foot. Butted up to the frame's edge.
In #2, the body angle suggests running, but it needs a little more information I think. Without that context, it might just be a young person with their tongue out.
#7 is tough for me because it's not clear his eyes are on the ball. It suggests that what is gonna happen next might be him muffing the play.
Still, these are mostly situational problems, no problems at all with your processing or technique.
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