Théo van Rysselberghe, Self-Portrait, (1888–89), Pastel and crayon on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35486

Fernand Khnopff, Der Jagdaufseher, 1883, Öl auf Leinwand, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/1790