A highly detailed character portrait of an anthropomorphic jellyfish pirate, standing proudly with a confident stance. The jellyfish's translucent tentacles are elaborately adorned with pirate accessories, gently swaying like a regal cape. The scene is backlit by an oceanic light source, casting ethereal rays that enhance the creature's bioluminescent glow. The pirate wears a weathered tricorn hat and a patch over one eyestalk, exuding a sense of swashbuckling adventure. The background hints at a shimmering underwater seascape, with faint silhouettes of sunken treasures. This dynamic composition captures the essence of a seafaring rogue from the deep, seamlessly blending the intrigue of marine life with pirate lore.