My original tumblr post was here. This illustration is Cosmic R’lyeh by DrFaustusAU (no relation [that I know of]). It contains the text “The stars are right again! Cosmic R’lyeh, Pacific Ocean dive tours. Heavily armed steam yachts depart Dunedin weekly.” It was originally posted on tumblr at cthulhu-hand-luke and comes to us via notpulpcovers.