The Parc Monceau, Claude Monet
In the Metropolitan Museum of Art; use the Download or Enlarge links under the image on their page.
This painting, one of several painted in an urban park in the heart of Paris, is one of my favorites from Monet’s period of painting in his signature style — what might be called “High Impressionism”.
The high resolution photo on the Met’s site is nicely lit, and gives you a feeling for the dimensionality of Monet’s paint application.