There is only one known portrait of Antoine Le Gras, the husband of Louise de Marillac. It is reproduced here. There is little commentary on the portrait, but the article gives biographical information about him.
Rybolt, John E. C.M., Ph.D.
"A Recently Discovered Portrait of Antoine Le Gras,"
Vincentian Heritage Journal: Vol. 18:
1, Article 5.
Available at: https://via.library.depaul.edu/vhj/vol18/iss1/5