Professor Alexander Williamson (1824–1904) John Collier (1850-1934)

The picture has something of this: portrait, people, musician, facial hair, man, music, performance, sit, singer, writer, concert, mustache, chair, leader, festival, indoors, wear.
Perhaps it’s a painting of a man with a long white beard sitting in a chair with his hand on his knee and his right foot on the arm of the chair.