The Edge of the Woods at Monts-Girard, Fontainebleau Forest, Théodor Rousseau, oil on wood, roughly 32 x 48 inches, (80 x 122 cm), in the collection of the Metropolitan Museum of Art, which has zoomable and downloadable versions of the high-res image.
Rousseau was one of the primere painters of the Barbizon School, painting in the nearby Forest of Fontainebleau.
This is a prime example of his paintings of the area, a wonderful contrast of light and dark and a beautifully balanced composition. I love in particular the studied variation of cloud types in the sky.