Thank you, these are lovely, particularly like the Night Of The Crabs and Killer Crabs artwork. The painting up front of Deathbell looks suspiciously like it was recycled from the Tandem Carnacki The Ghost Finder
Most of the british covers were randomly used for those pulps. Agencies bought them wholesale. In a few cases they even matched the original, like some of Lory's Dracula novels.
I own some of the german Smith's. They are edited for violence and sex in the translation, often heavily.