movie poster

I am learning how to make a movie poster, for the genre project. When I picked it i thought it would be easy enough but I never realized how much went to the movie poster. First you have to pick something tht discribes the plot in one image. Have to get people attention, really quickly. Some movie poster companies hire psychology to get the most attention grabbing techqunies. How most poster are of peoples face and shoulders instead of peoples whole body because it grabs peoples attention. Then there is some much that can be added credits, rating, title, realse date, and line from a credic. Each poster has to grab attention of the adudience it wants for the movie and also grab attention of others that the movie might have not entitional wanted to see. The movie poster has a big job to do in just one image.