Critique of My motion images

My first motion image is my dog running for a ball.  I was really happy with the image because the timing was great, and it had a slightly blurred background.  I probably could have used a slower shutter speed to blur the background more though.  My second image was a friend jumping into a pool.  Again, my timing was great, but the image turned out darker than I wanted.  The action was frozen with no blur so I was happy with that.