Colour pallets that are commonly use in horror film posters often include black and dark colours and red for things like blood.

The posters are mostly of the killer or the victim.
Settings are mostly of dark and mysterious places.
The text is normally bold, easy to see.
The titles use lexis from the semantic fields of horror films with language that includes blood and death.
Most posters have things like blood splatters, the killer and maybe the victim.
Props often include knives, axes , and any wepon .