Equestrian Portrait of Emperor Paul I c and sons Joseph, Palatine of Hungary Hermitage ~ Part 05

The picture has something of this: cavalry, people, seated, man, veil, woman, wear, mammal, two, lid, group, military, transportation system, helmet, uniform, outfit.
Perhaps it’s a painting of a group of people riding on the backs of white horses in a wooded area with trees in the background and a man on the far side of the picture.