Massive ancient creature swimming in abyssal ocean depths beneath alien ice planet, no open air

massive ancient creature swimming in abyssal ocean depths beneath alien ice planet, no open air, no surface, thick ice ceiling far above barely visible if at all, creature fills most of the frame and extends beyond it in both directions too large to fit, purplish-gray deeply wrinkled rough skin, blunt hard rounded snout like a battering ram built for cracking ice from below, tiny blue-rimmed eyes set far back from snout, long mandibles flanking the mouth, mid-body transitioning into heavy armored dragon scales, body becoming increasingly serpentine toward the tail which disappears into black darkness beyond the frame, creature curves slightly suggesting vast slow movement through the deep, no visible tail it continues into darkness, bioluminescent alien plants on ocean floor far below providing the only light source, cold blue-green glow from below, absolute darkness everywhere else, tiny barely-visible translucent ghostly female silhouette near ocean floor dwarfed by the creature above her, palpable darkness, ancient suffering trapped enormity, cinematic science fiction, photorealistic --ar 16:9 --style raw --v 8