The poster uses a minimum amount of color, but tries to make V look mysterious and dark as this reflects his personality in the movie, whereas Evey contrasts with V looking bright and open. The main text is very minimal with just the freedom forever line and the movies title, yet the bottom text is small and unreadable at a distance, this is because it is unimportant.
V For Vendetta - this dystopian fantasy of a future fascist England is one of the best depictions of a populace rising up against entrenched rulers. And it's not just the movie that will live, it's iconic mask has been adopted by anarchists and other foes of the social order. It will probably have an impact far into the future.