I cannot find information about them.
From history-of-fashion.tumblr.com/post/124183401549/18th-c-unknown-artist-anastasia-naryshkina; I lowered the temperature to remove some of the overwhelming yellow overtone.
Russian artists and aristocrats are aligning with western Europe as can be seen in this portrait. The younger girl flourishes a feathered headdress and all wear necklaces.
Keywords: Narishkin family, Russian, lace fontanges headdress, earrings, necklace, chemise, modesty piece, split bodice, scoop neckline, elbow length full flared sleeves, cuffs, lace engageantes, jeweled stomacher, waist band, bows, natural waistline, jeweled close upper skirt, flounces