Nice job...
Interesting movie. Do you plan to make a series about it?
You seem to be on to something with this one. However, it would have been better if the artwork better matched the overall mood of the movie. Even doing so much as lowering the contrast and dulling the colors would probably have had a nice effect.
I also find that the visual quality of the arms&armor that are used in midevil action scenes can have a strong effect on conveying the mood. Cartoonish looking swords and armor usually give a less serious feel than more finely detailed ones. Working on the chainmail should be a good start if you want to create a darker mood as the rings are a little too large, the lines a little too thin, and they don't quite overlap the right way.
Other than that, good job!