https://www.tuttartpitturasculturapoesiamusica.com/2015/05/Jules-Dupre.html#gsc.tab=0
(in Memphis Brooks Museum of Art)
https://www.metmuseum.org/art/collection/search/333941
A good quote about his art: https://www.nga.gov/collection/artist-info.1253.html
For all his immersion in nature, he was a stylist, highly selective in his choice of motifs, less interested in the immediate, fleeting appearance of landscape in changing light and atmosphere than in its enduring material existence, its character, arid its emotional suggestion. The studies he gathered out-of-doors served him only as the beginnings in a slow process of revision, transformation, and repetition carried out in the studio. Thus landscapes first conceived in the 1840s might remain on his hands for years, to be finished in the 1860s or 1870s, having meanwhile undergone the changes of his evolving style.