The best version of this image I have found is here.
Louise wears a sheath dress and powdered hair, quite a bit for a girl who may be all of ten years old.
Keywords: Elizabeth Alexeievna, Princess, Tsaritsa, Baden family, Romanov family, German, long curly coiffure, ribbon headdress, vee neckline, fichu, long tight sleeves, waist band, natural waistline, full skirt, necklace, wrap