An anime illustration of a humanoid green jellyfish creature, depicted in a medium shot against a dark, aquatic backdrop. The character has a translucent, gelatinous body glowing with a soft emerald luminescence, its head resembling the bell of a jellyfish with smooth, curved contours. Long, flowing tentacles cascade down from the shoulders and head, mimicking hair, with delicate, bioluminescent tips. The creature has large, expressive black eyes and a small, simple mouth, conveying a serene and ethereal expression. Its arms are slender and translucent, resting gently at its sides. The background is a deep navy blue ocean depth, with subtle bubbles and faint light rays penetrating from above, enhancing the underwater atmosphere. The style is high-quality anime art, featuring vibrant colors, smooth gradients, and a dreamlike mood.