Catherine the Great taking a walk in the park of Tsarskoye Selo Vladimir Borovikovsky (1757-1825)

The picture has something of this: people, wear, veil, military, man, woman, soldier, princess, portrait, two, royalty, lid, war, uniform.
Perhaps it’s a painting of a woman in a blue dress standing next to a white dog in a wooded area with a obelisk and obelisk in the background.