Cala Maria is a giant, lavender-skinned mermaid with a (presumably) dead octopus on her head, acting as a 'hair'. She wears a blue seashell bra, has pale aqua eyes, and has what looks to be gills on her arms, if not scars.
In her second phase, however, Cala Maria takes the form of a gorgon mermaid, with the octopus tentacles on her 'hair' turning into snakes, her eyes becoming yellow and cat-like, her teeth becoming razor sharp, her tongue turning fork-like, and her skin turning a shade of light green. The seashell bra she once wore is now made of seaweed or possibly grass.