The document discusses conventions in horror trailers, posters, and magazine covers. For trailers, conventions include building tension through faster cuts, showing little of the monster, and setting the scene without revealing too much horror. The author's trailer follows some conventions, like slow initial cuts and the static effect, but also breaks some by showing a dead body at the end. For posters, the use of red and a limited color palette are key conventions. The author's posters use red and a simple color scheme. Magazine cover conventions include actors in character, varied colors, and lots of elements; the author's cover includes these elements but is less busy than some examples.