Helene Schjerfbeck, Mädchen mit blondem Haar, 1916, Öl auf Leinwand, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/114101

Louis Marcoussis, Zither, Bottle, Pipe and Sheet Music, 1919, Watercolor, oil, gouache, ink, and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35042