Research film posters

I have been looking into different horror posters and i have came across early ones from the 1950'sThis is a film poster for Dr jekyll and Mr. Hyde and from this I can see that the posters do not really have any sort of scary gore but have cartoons to show that its a horror. Where as later on in the 1970's the posters become me graphic and supernatural as seen on this poster.
This poster is from 1998 and has also developed from the comic like theme on the Dr jekyll and Mr hyde to this life like supernatural.
Then in 2004 the saw poster, it shows more disturbing pictures and blood.
Looking at these posters i have found that through the years they have developed into more graphic and gorey images to shock audieneces.
From this research i think we should have one image on the poster showing bloody hands to fit with the more up to date horror film posters.