This interesting DVD mixes scenes from Taste the Blood of Dracula and Big Jake. Must be a bootleg DVD.
The painting looks to me like a cover image for one of the popular German Western-novel magazines. The artist seems to have worked from four different photographic sources. The first was obviously an image from a Dracula photo session:
Perhaps someone can identify the other two as well. The painting was used for a German DVD and also for a VHS release: