“The Thing of the idols, the green, sticky spawn of the stars, had awaked to claim his own. The stars were right again, and what an age-old cult had failed to do by design, a band of innocent sailors had done by accident. After vigintillions of years great Cthulhu was loose again, and ravening for delight.” ~H. P. Lovecraft; The Call of Cthulhu

It comes, without a doubt, Cthulhu is the most famous creation by Lovecraft and the name for the mythos it is forged. There is no need to explain in detail the role that Cthulhu plays in the mythos, essentially the high priest to the other gods. What is significant about Cthulhu is the core concept that Lovecraft established—beings far beyond our understanding and control, that we are mere insects. While he is mentioned in a few stories by the late author and the name of the mythos, he is not the most powerful as the others like Yog-Sothoth or Nyarlathotep. However, that does not remove the fact that his presence spells doom to anyone sane or curious about what they discovered and witnessed. Like the other gods, he can drive people insane just by looking at him, unkillable, and unstoppable.
As seen in my drawing, this is a scene in the book in first person perspective, where two remaining sailors are escaping the gigantic form of Cthulhu on the Alert, all the while a violent storm emerges as he makes his way to the ocean. How he is described might not be scary, but the massive and overwhelming appearance of him exiting R’lyeh is terrifying. I did illustrate Cthulhu like how he is visualized in the book, I also based his design on an old sketch that Lovecraft himself drew which he appears to have six eyes. The teeth and tentacles above his mouth are my insertion into the overall creep factor, that of making Cthulhu look uncannily humanlike. The shading in my drawing reflects Cthulhu's indescribability, obscuring any details and having an almost amorphous shape.