You own your hands. But you can't keep me from bending my hand anyway I want - even if it looks the same way as you bend yours. If you think about it Poses are not really copyrightable. Otherwise why would anyone own poser - pretty soon you wouldn't be able to make a move without infringing on someones copyright! However a "set" of poses may arguably protected in the market place. Conversely just because a pose may not be copyrightable does not mean that you cannot sell it. Just as you can sell anything in the public domain - you just cannot claim exclusive rights to sell it. Lots of people have made lots of money selling things legally that are not copyrightable. If I needed hand poses, I'd buy your poses in a heartbeat - not out of fear of copyright violation, but because it's time consuming and difficult to make good poses.