In the Park, Frascati. Study Gustaf Wilhelm Palm (1810-1890)

The picture has something of this: tree, water, wood, river, fall, landscape, outdoors, park, nature, leaf, daylight, scenic, lake, lush, waterfall, environment, summer, recreation.
Perhaps it’s a painting of a fountain in the middle of a park with a rainbow coming out of the water and a person sitting on a bench in the water.