A detailed character portrait of an anthropomorphic jellyfish pirate, with translucent tentacles flowing elegantly, posed in a dynamic stance. The scene is backlit by a setting sun casting golden light rays through the jellyfish's ethereal form, illuminating its vibrant colors and intricate textures. The pirate's attire is adorned with nautical elements, such as shells and seaweed, and features a tricorn hat perched atop its bell-shaped head. Bioluminescent markings on its body glow softly, adding a mystical touch. The background hints at a vast ocean horizon, setting a sense of adventure and mystery. This creative artwork is highly detailed and visually captivating.