Two models for Cellini's "Perseus and the Head of Medusa" exist and can be seen in the Bargello.
These figures are ca. 18" tall and in glass cases, making them difficult to photograph due to reflections.
The model on the left side is made of wax, and the one on the right is bronze.
The small lifesize finished bronze Perseus is permanently placed on the left side of the Loggia dei Lanzi
in Piazza della Signoria in Florence.