Windsor Castle from the Buckinghamshire Bank Unknown painters

The picture has something of this: water, river, vehicle, watercraft, architecture, harbor, city, bridge, transportation system, landscape, lake, seashore, outdoors, building, house, town, daylight, castle.
Perhaps it’s a painting of a castle next to a body of water with a boat in the foreground and people on the other side of the water and a castle in the background.