The posters in no way represent the quality of the film they depict; this is merely a list of posters that are excellent in themselves. The general criteria are effectiveness, originality, professionalism, and aesthetic appeal.
Here are my picks for the top 22, in no particular order.
[Special note: EVERY poster in the series' for The Man with the Iron Fists and Killing Them Softly was excellent. I just chose to include one because to leave them out completely for space reasons would be tantamount to a sin.]