A giant octopus with tentacles and glowing eyes in a cave

Cthulhu, mythical creature, tentacles, deep sea, darkness, mysterious, ancient, ruins, mystical symbols, mysterious glow, underwater palace,illustration,oil painting,highres,masterpiece:1.2,ultra-detailed, HDR,studio lighting,extreme detail description,professional,horror,realistic,vivid colors,deep blue tones, mysterious lighting

nsfw,low quality,normal quality,worst quality,jpeg artifacts,cropped,monochrome,lowres,low saturation,watermark,white letters,skin spots,acnes,skin blemishes,age spot,mutated hands,mutated fingers,deformed,bad anatomy,disfigured,poorly drawn face,extra limb,ugly,poorly drawn hands,missing limb,floating limbs,disconnected limbs,out of focus,long neck,long body,extra fingers,fewer fingers,multi nipples,bad hands,signature,username,bad feet,blurry,bad body