School VS Newgrounds
Here is the difference in the advice you'll be given at school versus here or from anyone else:
At school, while you are very good, expects that they will always have something to teach you, and so you will not be finished in there eyes until you've gotten a piece of paper that says so.
Newgrounds (and other amateur commentary) is always going to be a fresh surprise, whether it's good or bad. As long as you know not to blow up at someone who didn't like your cartoon (since you will never please everyone), you will always find a neat hint here and there about your strong and weak points.
Now that's kind of lumping them both into two categories (which is not fair because obviously there's a lot more to both), but I find that to be an adequate way to describe professionalism VS your peers and eventually your direct audience.
Well done on your cartoon, by the way. Can't forget to review the actual animation, LOL. I really like the timing of everything, and they seem to be a pretty good match. I wouldn't mind seeing a sequel. Some advice that I'd like to give you would be to join a team who needs help where you are strong, which would be good fluid motion, proportions, and creativity. Oh, let's not forget: You know your way around a fight scene!