A Comparison of Two Poster

These are posters of movie “The Lord of The Rings”, and the left one is episode I, the right one is episode II, and the movie totally have three set.
In the left poster, major roles appear in order who include Frodo Baggins, Gandalf, Aragorn(aka Strider), Sam, Arwen, Pippin, Merry, Bilbo Baggins, Legolas, Saruman, Galadriel, Boromir and Gimli. In the episode I, Frodo are given great responsibility, and in the episode II, Gandalf dominated the war situation. Therefore, the left poster that Frodo Baggins is most important role, he is in the middle, while the right poster is Gandalf looks most important.
The “spirit ring” in the episode I is also important role. They are express deep, dark and evil, they are the source of evil --- Mordor’s pawn. They are attracted by lord of the rings, so they always chases Frodo, in other words, they can be said the representative of evil and throughout the whole movie. In the left poster, they are in the middle and below to Frodo, and represent the evil of power, whereas the right poster is no “spirit ring”, they are not very important in episode II.
In the episode II, there are more countries join the war, so the right poster has king and princess and the prince's role, in contrast, the left poster have no these role.
Sam, Pippin, Merry, Legolas and Aragorn are always in the movie, they help Frodo to complete mission, therefore, they are also in two posters. Gandalf is in two posters but the significance is different.
Although two posters has same role, they contain different moral and content.