Not so fast Hive account@benfink! Technically I didn't have to credit this work at all, not even to Van Gogh himself. While the physical copy resides in Musée d'Orsay (correctly identified by Hive account@kenfinkel), the work itself is public domain in both its country of origin and the United States. From the image's online source:

This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or less.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1923.