Jaroslav Panuska (Czech, 1872-1958)
pencil, ink, and watercolor on paper (envelope)
There is another version, shown below, oil on pasteboard, 50 x 66 cm, in another private collection. See: Otto M. Urban, In Morbid Colours: Art and the Idea of Decadence in the Bohemian Lands 1880-1914
(Prague: Arbor Vitae, 2006), ill. 416, pg. 296.