a tiny chibi crab creature rests on a sandy reef rock in the extreme lower-left foreground, its domed cobalt-blue and violet iridescent shell catching pink and amber underwater light while the rest of the frame opens into a vast hazy blue water column, enormous teal-blue compound eyes reflecting the glow, transparent lavender-purple seaweed-frond antennae rising diagonally toward the empty upper-right, slender pink-coral legs tucked against granular white and tan reef texture, suspended micro-bubbles drifting upward through the negative space, dramatic volumetric light blooms placed far behind the creature rather than around it, macro close-up from below eye level, strong sense of miniature life inside a huge ocean, photorealistic 3D render with iridescent material shaders, cinematic underwater atmosphere, 8k