1) Regarding the looks:
Try having some shading in your animation to, you obviously know how to, hence the garbage can at the end. I don't like the rough lining, it makes your draws look a lot worse then they are. Using another drawing tool is an easy fix.
2) Regarding the rest:
You say this is practice so you propably know this isn't to funny or interesting. I hope seeing something good from you soon, I'm sure you have the potential.