The Influence of the Cancan

... as felt in different Parisian venues:

The original cards are available at Del Campe.  The artist is Jacques Wely (1873-1910).

http://www.delcampe.net/page/item/id,235146465,var,75-PARIS-QUI-DANSE-CASINO-DE-PARIS-CABARET-ILLUSTRATEUR-J-WELY-DANSE-DANSEUSE,language,E.html

http://www.delcampe.net/page/item/id,235146582,var,75-PARIS-QUI-DANSE-A-LA-BOULE-NOIRE-CABARET-ILLUSTRATEUR-J-WELY-DANSE-DANSEUSE,language,E.html

http://www.delcampe.net/page/item/id,235146693,var,75-PARIS-QUI-DANSE-AU-JARDIN-DE-PARIS-CABARET-ILLUSTRATEUR-J-WELY-DANSE-DANSEUSE,language,E.html

Note the similarity of the first illustration above to:

http://barbebleu.tumblr.com/post/48021881283/in-the-wings-a-couple-of-dance-critics-observe

For another of this genre by Wely featuring a ballet dancer, see:

http://www.delcampe.net/page/item/id,235146348,var,75-PARIS-QUI-DANSE-A-LOPERA-CABARET-ILLUSTRATEUR-J-WELY-DANSE-DANSEUSE,language,E.html

A biography of Wely from "Illustrators of Montmartre":

http://books.google.com/books?id=eIsmAAAAMAAJ&pg=PA57&lpg=PA57&dq=%22+j+wely%22+artist&source=bl&ots=gMBTHIL2oD&sig=L08JGED5VNOAwj3CDfAU2GP7-Zo&hl=en&sa=X&ei=fvxvUsjUI8fp2AXbmYGwBA&ved=0CFUQ6AEwBg#v=onepage&q=%22%20j%20wely%22%20artist&f=false