May I point your attention to the art of Mr. James Wolf. I found him while browsing one of the Cthulhu Mythos related websites I more or less frequently visit.
This work of his is titled „The Hounds of Tindalos“ (you may have guessed it…)
To see more of his magnificent work, please saunter here.
He does not only do Mythos-related illustrations, not by far. Just see for yourself, and bring some time, too. You will not be disappointed.