Photograph of Yelena Yakovlevna Tvetkova (1872-1929) in the role of Rachel from César Cui's opera Mademoiselle Fifi; date of photo not given, but presumably this is from the time when she premiered the role (1903).
Printed source of image: Кюи, Цезарь Антонович, Избранные письма [Selected Letters]. Составитель, автор вступительной статьи и примечаний И.Л. Гусин. Ленинград: Гос. муз. изд-во, 1955, p. 285. (Note: the caption for the photo in this source mistakenly labels the role as "Fifi" (a male character), but Tsetkova played "Rachel.")
Photograph of Yelena Yakovlevna Tvetkova (1872-1929) in the role of Rachel from [http://en.wikipedia.org/wiki/C%C3%A9sar_Cui César Cui's] opera ''[http://en.wikipedia.org/wiki/Mademoiselle_Fifi_%28Cui%29 Mademoiselle Fifi]''; date of photo not gi