How do you make movement look...

[unconsidered]

Natural? I'm trying to move a hand to a face. At first the hand was too slow, so I had the hand travel a greater distance per frame. It worked, but the hand looks very wanky now; like a machine movement like a car or a crane. Do I use more frames for the action? Or do I limit the movement distance of the hand?

[Celshaded]

You have to pay attention to your timing and spacing for the action you're doing. First, act out the motion you're trying to do in front of a mirrior. Pay attention to when the action slows in and out.
You never want to have all of your frames evenly spaced between your keys. If you're slowing in then you want more frames favoring your first key, and vice versa for slowing out.