Mme Favart wearing black dress with white lace collar tied with a bow, her lace bonnet adorned with pink roses (two artist's joins). Miniature. 
It's not Justine De Ronceray (d. 1772).
<bdi><a href="https://en.wikipedia.org/wiki/en:%C3%89douard_Li%C3%A9nard" class="extiw" title="w:en:Édouard Liénard"><span title="French painter (1779-1848)">Édouard Liénard</span></a>
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<a rel="nofollow" class="external text" href="https://www.lotsearch.net/lot/jean-auguste-edouard-lienard-french-1779-1848-39719170">Lotsearch</a>, image cropped by the uploader