"Create a photorealistic image of a stunningly beautiful teenage girl, about 16 years old, with long, flowing white hair featuring sea-green highlights. She has piercing green eyes and a delicate, ethereal appearance. The background features a shadowy, ominous depiction of Cthulhu looming subtly in the distance, blending mystical oceanic and cosmic elements. The overall scene should have a dark, fantasy theme inspired by Dungeons & Dragons, capturing an ancient, otherworldly atmosphere with high detail and resolution."