Foremost, cut off by the right picture edge, is a woman with her face illuminated by a greenish light.  
In the background a woman in a black dress is in profile, and next to her is Goulue who adjusts her hair.  Walking past them are the very tall Dr. Gabriel Tapie' de Celeyran and his cousin, the artist himself.  The foreground is dominated by three men, two in tophats, and two women gathered around a table. One of those women has her back to the viewer and a bun of bright red hair.  Foremost, cut off by the right picture edge, is a woman with her face illuminated by a greenish light.  FTP, name this 1892 painting of a popular Parisian nightspot by Henri de Toulouse-Lautrec
In the background a woman in a black dress is in profile, and next to her is Goulue who adjusts her hair.  
At the Moulin Rouge