@Juan: I'd say that pose at the beginning looks at little odd. I seems like his torso and head are tilted a bit too far in opposite directions. The swing also needs more of a follow through to it. He's putting his whole body into it, so his torso should be fully rotated and his arm should be fully extended for a moment before he pulls himself back. I guess also more overlap on the torso when he's teetering on the edge at the end, before he falls.
@Steven: Yours is coming along pretty well, all the basic stuff seems ok. Are you going to add him looking back up at the fly at the end?
@Emily: Your torso looks fine to me, nothing looks too weird about it.