Playing with IK Solvers

Here I used IK limb solver to animate the ghost for the haunted house. I had a few problems with the hands as the skin modifier didn't attack itself to the bones on the fingers very well, so when I created a fist the skin deformed. I'm not too sure whether the problem is with the position of the bones or a setting in the modifier panel. For the animation I don't really need the fingers to move, but I'll need to find a solution for when I create a moving hand in the future.