Nicolas Poussin
The trees, shepherd, and goats are all in the foreground. The middle ground holds the lake, a few small buildings [stables] on the right of the painting, and the livestock. The palace is actually pushed further into the background from the objects in the middle ground. It is much smaller in relative size to the small buildings and livestock in the middle ground. Other objects in the background include the mountain and sky.
From Getty.edu
The trees, shepherd, and goats are all in the foreground. The middle ground holds the lake, a few small buildings [stables] on the right of the painting, and the livestock. The palace is actually pushed further into the background from the objects in the middle ground. It is much smaller in relative size to the small buildings and livestock in the middle ground. Other objects in the background include the mountain and sky.
From Getty.edu
Not sure who the artist is for the horse's piece of art.