|Portrait of Henrietta Girshman. 1904. Gouache on cardboard. 100.8 × 70 cm. Tretyakov Gallery|
Gouache can also be handled as a finished medium in its own right. This 1909 portrait of Yelena Oliv is 37 x 26 inches, and combines gouache, watercolor, and pastel on cardboard.
|Portrait of Alexei Morozov. 1909. Gouache and pastel on cardboard. 37 x 23.5 in.|
According to a recent article in the Tretyakov Gallery Magazine, he also used tracing-paper to help find the essential statement: "Having drawn a figure on a semi-transparent sheet, he would put another such sheet over the drawing and, having traced the best lines, continue to draw on this new base."
According to Igor Grabar, "Serov believed that the artist ought to be adept in every available medium because nature itself is infinitely diverse and inimitable, just as the artist's mood and feelings differ from one day to another: today he wants to work in one way, tomorrow in another."
An exhibition of the work of Valentin Serov, in honor of the 150th anniversary of his birth, is currently on view at the Tretyakov Gallery through January 17, 2016. The show takes up three floors of the museum, with extensive areas devoted to watercolors and drawings.