Many Hollywood films tend to follow similar patterns in the way their posters are made and advertised to the audience, common trends pop up such as; the main character of the film centred in the middle, the title below the character, a wall paper in the background, the name of the actors in the film located at the top of the page, its release date and a slogan to promote the themes of the film.
Examples from modern cinema include:
The Dark Knight Rises
SkyFall
Final Destination
However, in the past, and in different countries, there have been a lot of abstract and more unique ideas for certain posters, which I believe would be useful for the story in our film.