Carolus-Duran was among the most celebrated portrait painters working in Paris in the 1870s.
With his casual pose and elegant clothing, he is presented as a dandy or fashionable man-about-town.
On his lapel he wears the red pin of the French Legion of Honour, awarded for his contribution to the arts. Sargent studied with Carolus-Duran, launching his own career by exhibiting this portrait to great acclaim.
Along the top, he added an inscription paying homage to his teacher and describing himself as an “affectionate pupil”.