Movie Poster Conventions

What I have made here is an Empressr presentation on the conventions of a movie poster, as I will be creating one for my pack. The presentation doesn't go into too much detail, because not much is necessarily needed. My reason for this is that whilst I do need to see what is right and wrong to put on a film poster, all film posters are different, so I won't be able to take a great deal of inspiration from these.
What I have here is some knowledge on film poster conventions and perhaps a few ideas that I can redo myself in a post-modernist style, but ultimately I am going to have to start from scratch with this in a sense, as that's what I need to do to make mine original and eye catching.