Pretty nice... reminds me of Age of Empires soundtrack.
My main tip is to try moving away from repetition... however much fun it is, classical doesn't have a lot of it except for the early stuff. This sounds like video game music to be honest.
You did a good job with switching percussion up. However, for more 'epic' stuff, think about having many instruments, not just more epic percussion. I suggest you listen to some film scores such as that to Lord of the Rings, the Narnia series, and so on... they are great inspiration for "epic" feeling pieces... same with music to some computer games.
A nice piece, I actually really enjoyed this for some reason. Not exactly classical, but nice and varying. Good job, keep working on improving your stuff. :)