Williams, Pyotr Vladimirovich (1902-1947) Man in a boat (sketch)

Below right is the signature in Cyrillic in pencil "Man in / boat. / N18", bottom left "1926". The picture shows the artist's notes for colores (in the sky "blue", on the cheek "brown / grey", on the chest "Brown", on the belt of trousers
"red". On the back of the sketch there is the same figure in a
different perspective.