Not sure. I think I was channeling Ridley Scott a little bit in the outlining stage. There are a lot of Alien-esque features I didn't think of at first.
As for everything else, CREATIVE LIBERTY MOTHAFUCKA DO YOU SPEAK IT
Actually, pretty much every Cthulhu illustration looks some degree of the same (generic chubby octopus man, with some exceptions). I was wanting something different, and I'm gonna be a lazy ass and justify the disproportionate body with a semi-related quote from
The Call of Cthulhu:
...for instead of describing any definite structure or building, he dwells only on broad impressions of vast angles and stone surfaces - surfaces too great to belong to anything right or proper for this earth, and impious with horrible images and hieroglyphs. I mention his talk about angles because it suggests something Wilcox had told me of his awful dreams. He said that the geometry of the dream-place he saw was abnormal, non-Euclidean, and loathsomely redolent of spheres and dimensions apart from ours. Now an unlettered seaman felt the same thing whilst gazing at the terrible reality.
Granted, that discusses the appearance of the city of R'lyeh, but I would imagine that the Great Old Ones who built the place would share the same similar disorienting appearance.
It's pretty much just a semi-intentional creative liberty approach after watching Aliens all night. lol