Maria Feodorovna wears either the dress shown in the last image or one just like it, complete with robes and imperial crown. The only differences I can see is she is not wearing bracelets and the chair and background are different.
Keywords: 1883, Maria Feodorovna (1847-1928), Princess, Tsaritsa, Glucksberg family, Romanov family, long curly coiffure, crown, off shoulder scoop neckline, Russian sleeves, vee waistline, A-line skirt, over-skirt, order sash, order chain, necklace, robes, fur