Research and Planning: Codes And Conventions Of A FIlm Poster

From doing an analysis of a film poster today I have realised the things that I will have to include in my horror film poster. I will have to include a big picture for the main character in the film, but they will also have to be showing that the girl is possessed. Also I need to consider the colour of the poster, adding tints to the poster, for example a grey shade over the top of the poster to show that it is dull. Also I need to add a slogan at the top of the page to match the type of horror film it is going to be.