When Paul Morrisey's excellent BLOOD FOR DRACULA (aka Dracula cerca sangue di vergine... e morì di sete!!!) was released in Japan under the title SHOJO NO IKICHI (Fresh Blood of the Virgin), its Japanese distributor created an unprecedented seven different B2 poster artworks and an additional design for the film's flyer. So all in all, the distributor commissioned the printing of eight different artworks for a single film (not even counting the pamphlet, press sheet and lobby cards).
Why create such a high number of designs for a movie with comparably limited commercial appeal?
Normal at that time and for similar exploitation releases by the same company, e.g. THE TEXAS CHAINSAW MASSACRE, FLESH FOR FRANKENSTEIN or THE LIVING DEAD AT THE MANCHESTER MORGUE, were two poster versions - and, at the most, an additonal flyer design.
One assumption is that the distributor wasn't sure how to market the movie, so they developed different posters to cater to different audiences. Another is that whoever was in charge of marketing the movie liked the film so much that he/she wanted a wide range of posters designs developed.
You can see from the artwork posted below that the designs range from lurid and bloody to rather artistic, so there is no clear marketing strategy visible, leading to the conclusion that the first assumption seems to be the more plausible.
Talking to many knowledgeable Japanese collectors over the years I was not able to find a definite answer. BLOOD FOR DRACULA received such a limited release in Japan and its posters are rare (some more so than others) that very little information is available about its history.