There may be several versions of a film poster for one film - as it can vary depending on country, size of poster and also the content of the film.
Which, could mean that the poster is one of the first things made (after a rough cut) which can be based on what the film includes, however, if they add in a new/different scene then that could effect the film poster due to the different meanings.
Different types of a film poster:
- Teaser poster: gives off some idea about the film.
- Character poster: using the poster to promote some of the actors who are in the film.
- Motion poster: a new style of poster which is animated.