Stay Aggressive

More than anything, you'll find this industry is about being aggressive. Maybe it's the same in every industry, but I think it is especially true in this one. It is up to you to step up and take what could/should be yours. Responsibilities don't just get handed out. They're usually given to the first person who steps up and says "I'll do that." In fact, even if it is outside of your current description, the guy who steps up and takes ownership will be th person who gets the assignment. There can be downside in being too aggressive--being labeled as a cut-throat bastard, being seen as not knowing your place, being labeled as immature, etc. But in the cases I have seen, senior people are willing to give you a shot on most things. If you can prove you can do something, then it's yours.

The skys the limits if you can convince people that you can handle the responsibilities that are available. Once you have responsibilities, you can ask for the commensurate promotion, more pay, etc with impunity.