an extremely high-resolution, hyperrealistic image of an ethereal, bioluminescent jellyfish deep in the ocean. The jellyfish should glow with a faint, eerie light, featuring vivid colors against the dark ocean background. It should possess numerous tendrils, each glowing softly, enhancing the mystical ambiance. Emphasize intricate details, capturing the delicate texture of the jellyfish and its tendrils in ultra-high definition (UHD). The image should strive for photographic perfection, using HDR techniques to balance the faint bioluminescence with the surrounding deep-sea darkness. Aim for the highest quality and best composition possible, making this a true visual masterpiece in 16k resolution. ((16k, 8k, 4k, UHD, HDR, hyperrealistic, ultra-detailed, masterpiece, best quality, perfect composition, best composition, high resolution, extremely detailed, highest quality, extremely high quality))