Kalmyk Lama. 1869-1870 Vasily Vereshchagin (1842-1904)

The picture has something of this: people, wear, cavalry, veil, group, man, weapon, seated, mammal, sword, soldier, military, two, lid, woman, outfit.
Perhaps it’s a painting of a man sitting on top of a black horse next to a man in a yellow outfit and a woman standing.