The image is a vintage watercolor painting of a sea slug. The sea slug is elongated and oval-shaped, with a mottled pattern of brown, white, and cream-colored spots covering its body. It has a distinct head with two prominent eye-spots and a slightly ruffled edge along its body. The sea slug is depicted against a pale yellow background. Above the sea slug, there is Japanese calligraphy. Below the sea slug, there is English writing that says 'Reef of Okinawa (6)'.