From lisby1's photostream on flickr; image cropped by gogm.
Louise poses in archtypical Lely style, but a little more décolleté in this Lely portrait.
Keywords: Lely, Louise de Kérouaille, Duchess, mistress, Charles II, spy, long curly coiffure, chemise, modesty piece, elbow length puffed under-sleeves, cuffs, split bodice, vee neckline, elbow length over-sleeves, clasps