I also created a movie poster for 12 Angry Men. Choosing the element; line and the principal; balance I generated some ideas.
I began by sketching some ideas.
By taking an aspect of the film, where 11 men, on a jury, say a person is guilty and one man says not guilty, I have experimented with possible designs.
I then experimented with idea of the way the men are sat around the table in the film.
And a flipped the ticks, thinking that a tick would represent guilt and the x represented not guilty.