Ok, what you have going here are linear curves in your graph editor.
The balls go up and down in a very robotic way, there is no weight to it.
Look at the image with the two balls and the hand. See how straight those two lines are? I figure your curves look like that.
You need to have them like the other image with the rounded curve. Your Y curve in the graph editor needs to look like that.
Check out this site for great reference.
Basically as the ball falls down it accelerates. So the spacing needs to grow from frame to frame. So as it falls down there is bigger and bigger space between eye key/position of the ball.
The opposite happens as the ball goes up. As it bounces up it will slow down and the spacing will get smaller and smaller.
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