portrait: artistic representation of one or more persons

military uniform: standardised dress worn by members of the armed forces and paramilitaries of various nations

studio: working place set aside for artist to work, the term is generally applied to workspaces used by artists creating fine art, particularly art dating from the 16th century to the present

bust: sculpture of the upper part (head, neck, and a variable portion of chest and shoulders) of the human figure

Custódio José de Melo: military and politician, admiral of the Brazilian Navy and federal deputy for the State of Bahia (1840–1902)