Here is an animation that I am working on. The entire shot is still developing as yo will see but I thought I'd share it with you anyway.

Things to note:
I didn't turn on the motion blur.
This is not a layered composite. it's a straight beauty pass.
The animation is still being tweeked.
The matte was not available to matte out the tree that the alien is suppose to be standing behind.
The shadows are not turned on.

I'll post the final results in a week or two.

alien animation clip