Lisa or Anna Duncan, ca. 1915-20

Arnold Genthe ::  Lisa Duncan dancing on a beach, Long Beach, Calif., ca. 1915 | src NYPL, Isadora Duncan Collection
Arnold Genthe :: Lisa Duncan dancing on a beach, Long Beach, Calif., ca. 1915 | src NYPL, Isadora Duncan Collection
Arnold Genthe :: Anna Duncan dancing; between 1920 and 1942; from a photograph taken ca. 1920. Lantern slide. | src Library of Congress
Arnold Genthe :: Anna Duncan dancing; between 1920 and 1942; from a photograph taken ca. 1920. Lantern slide. | src Library of Congress

related post

Duncan by Genthe for Red Cross

Arnold Genthe ~ Isadora Duncan. The Roll Call. A Masque of the Red Cross by Percy Mac Kaye, 1918. Chromolithographic poster | src NPG · Smithsonian Institution

Isadora Duncan by Atelier Elvira

Dancer Isadora Duncan, 1904. Anonymous photographer (*) | src Theatermuseum Wien : Alles tanzt
Isadora Duncan (1877 – 1927), founder of Free Dance. Photo by Studio Elvira, Munich, ca. 1910 | src alamy
Hof-Atelier Elvira ~ Isadora Duncan, 1904 | src Theatermuseum Wien
Dancer Isadora Duncan, 1904. Anonymous photographer (*) | src Theatermuseum Wien : Alles tanzt

(*) Even though this photo is uncredited (and undated) on source (Theatermuseum Wien), note that the image bears a blindstamp with the date (1904) with the same typography as the third photo in this post and in the same place (lower left). Furthermore, the dance costume and hairstyle in the “anonymous” photo is just the same as in the image found in Alamy (second image of the post); that said, it is highly probable that the maker of this image is also Atelier / Hof-Atelier Elvira.