The blood and sweat!!!
Very impressive for student work! 2D Cel animation is a dying art in America now a days. Too bad, cuz all that CGI 3D stuff is just getting to redundant. I know this isn't an actual cel animation, but a pencil test instead. However, alot of folks (or the average eye) always soon forgets the amount of blood and sweat it takes to create this kind of animation. It's not just a simple move the rigged skeleton from point A to point B, but every single frame needs to be individually drawn. It's been awhile since I've taken 2D animation class, but I think it was 30 frames a second. That's 30 seperate drawings per second. Do the math from there.
GOOD JOB MAN!!!