Focus on Portrait of a Man (Velázquez) and explore the Subject matter.
The painting was painted from life with an informal handling, and Duveen may have had it retouched to appear more "old masterish". The portrait closely resembles that of a figure at the far right of Surrender of Breda, also by Velázquez, which was painted to memorialize a victory by Spain over the Dutch. It is possible, though uncertain, that both portraits are self-representations of the artist.
Surrender of Breda