A correlation i see between these posters is that they are all a bit dark, they feature a main character, 3 of which by a close up headshot. they all have the title on.some have more details like release date, some have actors names or "from the makers of" as this might sell the film. 
Now i don't have a main character, or famous actor or anything like that so I actually don't know what to do to make my poster look awesome>?