A pleasingly retro Dave Carson original from 1980, up for sale on eBay (not from me)…
This led me to discover his 2022 artbook Called by Cthulhu: The Eldritch Art of Dave Carson, with an introduction by Neil Gaiman.
And further, that a Special Collector’s Edition — in larger 10″ format and three volumes — appeared in the spring of 2023. This appears to be still available.