Mount Kennedy, County Wicklow, Ireland William Ashford (1746-1824)

The picture has something of this: tree, people, cavalry, park, grass, landscape, recreation, fall, outdoors, sky, light, garden, daylight, group, two, castle, house.
Perhaps it’s a painting of a man riding a horse next to a woman on a horse and a dog on a path in a wooded area with a white house in the background.