John Manners, Marquess of Granby Allan Ramsay (1713-1784)

The picture has something of this: people, wear, woman, portrait, man, two, footwear, pants, recreation, music, seat, facial expression, girl, lid, indoors, fashionable, jacket.
Perhaps it’s a painting of a man in a blue coat, red pants, and white shirt with a cane standing in front of.