![[Image: N2PYjL5.gif]](/image.php?src=http%3A%2F%2Fi.imgur.com%2FN2PYjL5.gif&hash=0d10725ef57db490d30d51cd9d151619)
I think what E-Man was looking for was an anticipation frame. Note the second frame pulls back even further, making the animation look a bit smoother while also adding the illusion of force to the swing. I also changed the legs because they jitter around too much the way that plays.
[EDIT]
I changed the mouth so it doesn't open into a rectangle. It just looks creepy when it's like that, like a mad puppet or something.