RedBullRacer,
I geuss.. well you know, ofcoures it's the beginners section, and you're definately still at the beginning of learning :p (no offense), but the biggest tip I can give you right now is just to keep animating, keep practicing, every time you animate something you become a little better!
you just have to work on everything really, I can't give you an accurate CC on what to improve.. though what bothers me in your animation is that the head has a green outline, and the block where the character collides on appears when he jumps, it isn't there from the start, and, what is the thing that hits the character? I reckon it's a bullet, but it moves too slow for a bullet, and it's waaayy to big, is it a cannonball then? well not much a ball :p, a rock? allright, if it's a rock, why is the character stuck on the wall, if the rock isn't even touching the wall.
but these are just some things that I noticed, I mean, you're doing great for your second animation! my second animations were a disgrace haha! just keep practicing and you'll get better!
here this is what I made, I've always wanted to animate 'benders' (fire, earth, water and air) inspired from the Avatar series.. I'm now going to practice it, because I think I've got the character animation down..
here is my first test, if anyone has any tips on how to create 'fire' coming out of a characters hand, or any tutorials I'd love to see them! this isn't exactly how I plan the fire going to look like, but I really have to learn how to animate different kind of fires right now.. because I can't animate a firebender. eitherway here it is:
http://www.truploader.com/view/512645