The artist is Rokotov
Vorontsova Maria Artemyevna (nearer. Volynskaya; 1725-1792)-daughter of executed in 1740 cabinet-minister a. P. Volynsky and a. L. Naryshkina, native niece of Queen Natalia Kirillovna. After the execution of Father Soslan to Siberia, and tonsured in a nun in the Yenisei Christmas Monastery. Upon the reign of Elizabeth Petrovna, a monastic vow was removed from her in 1742 and allowed to return to Moscow, where she married the count and. And. Vorontsova.