Тимм Василий 1820 1895 Портрет императора Николая I на коне 1840 Холст масло 131х105 см часть 2 - Russian and soviet artists Русские и советские художники

The picture has something of this: cavalry, seated, sword, military, man, wear, people, weapon, mammal, lid, veil, soldier, two, warrior.
Perhaps it’s a painting of a man riding on the back of a brown horse with a plume of feathers on his head.