Matteson Art

Close-ups (both are upside down!):

The painting may be viewed upside down and you can see the purple horse and rider are part of a painting on an easel (the easel legs run off the frame. So from the upside down vantagepoint it’s a painting on an easel in front of a painting. 

She's being followed by the man with the umbrella who appears in two other scenes.

Here (below) is the actual location in England where she rode her horse.