I don't agree with the assessment that the eyeball "might be a reference to a specific Lovecraft character, Cthulhu ... [who has] tentacles coming out of his face and one all-seeing eye." I think that may be confusing the references to 'cyclopean' architecture and even a reference to Polyphemus: "... the titan Thing from the stars slavered and gibbered like Polypheme cursing the fleeing ship of Odysseus. Then, bolder than the storied Cyclops, great Cthulhu slid greasily into the water and began to pursue..."
The FBI flyer offers a reward of up to $10,000 for info. Sadly, the images don't seem to show any of the Lovecraft-related material. Not that that would be likely to help much.