Back to Traditional: The Ball Bounce

I'm working on some traditional tests with some guys from work.  We're starting from the very beginning: The Ball Bounce.  The twist here is that after two bounces, the ball has to change into a cube:

This is my second pass (the first pass can be found here). It was done using Pencil (animating software), but I plan on doing my future tests traditionally (paper and pencil).  Next up is another classic, the Flour Sac Walk cycle.