Upgrade image posted 10 December 2016 from nevsepic.com.ua/art-i-risovanaya-grafika/25688-christina-robertson-1796-1854-50-rabot.html; spots removed with Photoshop.
It looks like Zinaida is emulating one of the Mancini sisters from the days of Louis XIV and doing a very good job.
Keywords: Robertson, Zinaida Yussupova the elder, Zinaida Naryshkina, Countess de Chauveau, Marchioness de Serres, Naryshkin family, Yussupov family, Russian, frizzy coiffure, hair jewelry, necklace, earrings, lace modesty piece, notched vee neckline, bodice, bertha, notched sleeves, lining, lace flared cuffs, clasps, theatrical dress