The image is a vintage illustration of a mermaid, rendered in a style reminiscent of 18th-century scientific drawings. The mermaid is depicted with a human-like upper body and a fish tail. The skin tone is a warm, reddish-brown. The mermaid has a small head with a prominent nose and ears, and a beard. The arms are outstretched, and the hands are delicately drawn. The fish tail is detailed with scales and a fan-like tail fin. To the left of the mermaid is a vertical scale marked with numbers and the word 'Pouces' (inches). The background is a muted olive green. Text is present at the top and bottom of the image, likely indicating the title, date, and artist. The text reads 'La Sirene' at the top and 'Obs. de M. Troussaint' and 'par M. Gauthier sc. près l'Observatoire' at the bottom. The artist's name 'Gauthier major sculp.' is written to the right of the mermaid. The overall impression is that of a historical scientific illustration, possibly from a natural history study.