Portrait of William Costen Aitken (1817-1876) Frank George Jackson (1831-1905)

The picture has something of this: portrait, people, man, facial hair, mustache, music, cravat, wear, jacket, profile, side view, veil, vest, collar, scientist.
Perhaps it’s a portrait of a man with a beard wearing a black suit and a white shirt with a black bow tie and a black collared necktie.