I found this on a Google search, but the link did not connect to this image.
It seems Princess Maria was a noted turn-of-the (last) centurt beauty, here wearing a frilly décolleté evening dress.
Keywords: Maria Abamelek-Lazareva, Moina Abamelek-Lazareva, Moina Demidova, Princess, curly coiffure, square décolletage, close sleeves, bertha, lace, bows, choker necklace, necklace, earrings