First off, way to go! No small feat! The part where the band member stole his books too made me laugh. If I was going to make a critique, I would say the animation is the area that needs the most work. That is to say, if you really worked hard on the animation, it would improve the short more than working on the lighting, for example (I think others would disagree).
Try tackling a shorter project, or even take a small segment of this and see how far you can push the animation. Make sure the body mechanics make sense (act it out yourself) and work on making it fluid and organic (open up the graph editor and change up the tangents, for example). Make sure there's no slipping on the ground during walking.
In another area, I thought the cuts could have been tighter and the pacing improved. Finally, I agree with Genny that the story didn't have a strong introduction or premise.
But all that aside, keep up the good work!