Portrait of Ernest Chasseriau The Painter-s Brother in the Uniform of the Eco Theodore Chasseriau (1819-1856)

The picture has something of this: portrait, people, wear, woman, uniform, military, outfit, military uniform, retro, man, vintage, girl, administration, model, lid, music, leader.
Perhaps it’s a painting of a young boy in a black uniform sitting in a chair with his hand on his chin and his right.