The Great Old One Cthulhu, bursting from the waves to attack a ship, from The Call of Cthulhu by HP Lovecraft.
And yes, I know, in the story, the boat's a steamship. No idea what I was thinking there...
As far as I am aware, Lovecraft's creations are now in the public domain, and even if not this would be fan art, but if I need to put some copyright gubbins here, let me know.
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