Not bad...
...But not great, either. S'okay, we start somewhere, right?
A few pointers:
Reign in those shoulders! Seriously, the shoulders on the soldiers are jutting too far out from the chest, it looks kinda weird. Some anatomy drawing practice should take care of that problem.
English. I know you stated that it isn't your first language, and there wasn't a problem with the spelling or anything, but your syntax was crazy, man! It made the movie unintentionally funny. Not really a big issue, though, unless you want your western coutnerparts to take it a little more seriously.
Otherwise, just use a more varied soundboard/track next time. Left 4 dead is still too fresh in our memories, feels a bit like a cop out.
Lastly, you say they're in the woods... but I didn't see any trees... or stumps for that matter. Just a heads up.
Good luck on part 2!