Here's what I did.
#1: Not much had to be done here except thicken the tail and move the paws around.
#2: All the had to be done here was move the paws.
#3: Nothing at all really you did pretty good!
#4: This is the one I took the most time on. I had to move him forward he was a little too far back, the paws, if he's come skidding around the bush then one paw would be extended for him to push off of. The other would be ready in the air to be put down and finish the turn.
But over all I didn't really see any problems! Good work!
