Adélaïde Labille-Guiard (April 11, 1749-April 24, 1803) was a French painter who was a master at miniatures, pastels, and portraiture.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Ad%C3%A9la%C3%AFde_Labille-Guiard
Louise-Elisabeth of France, Duchess of Parma by Adélaïde Labille-Guiard
1788 / Oil on canvas / 107″x63″ / Palace of Versailles, France
Adélaïde Labille-Guiard on Artnet: http://www.artnet.com/artists/ad%C3%A9la%C3%AFde-labille-guiard/