Welcome to Bootcamp soldier. We'll make a man-i-mator out of you

OK, first off, your movie file size is way too big for such a simple exercise. No need to be cute with lighting, motion blur and all that. Besides, it makes watching your movie for critique difficult.
I'd like to ask if you have Richard William's "The Animator's Survival Kit" book? If not, get it, somehow, maybe you can find a second hand copy from Amazon.com. In this book you'll find all the exercises we do here and in detail.
From what I can see of your bounce, the ball is squashing before it hits the ground. Rule of thumb: first frame ball touches the ground it must be in maximum stretch. Next frame ball is squahsed. Next frame ball is off the ground and in maximum stretch again. The only time the ball is in default shape is when it is in its highest point up.
All this you'll find in the book I mentioned. Now get back there and do 50 laps