Andrew Ritchie was a staple contributor to BOOM!'s Mythos titles. Necronomicon was drawn by Andrew Ritchie. Fall of Cthulhu's first volume, The Fugue, featured Andrew Ritchie's work. Cthulhu Tales had some stories illustrated by Andrew Ritchie.
Ritchie is known for his eerie, corpse-like characters and monsters mixed with old-school comic book colors. "The Beach" from Cthulhu Tales is a good example. Michael Alan Nelson, who wrote Fall of Cthulhu, creates a typically horrifying story, but Andrew Ritchie's art will freak the hell out of you. Seriously. It will stay with you for a while.
Anywho, I'm a fan of his work, so I naturally contacted him to do a pic of Azathoth's throne. He already drew Azathoth in Necronomicon:
After a while, he agreed, and sent me the result today.
One word: wow.