You have some pretty good animation going on here. All the characters moved with a nice fluidity to them.

My main problem with this film, though, is cinematography. Many shots have the characters sitting way to low in the frame, with a lot of awkward empty space left on top of them. The shot of Superman from 1:08 onwards gives an example of what I mean. Superman is far to low in the frame. To improve this, look up a thing called "The Rule of Thirds". This technique will help you line up stuff in the frame at more appealing points and give your images a more aesthetically pleasing look to them. There's more to good cinematography than just following the rule of thirds, but it gives you a good foundation to build upon.

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