This can be considered to form a triptych together with 2 other portraits dating from the early 1930s, the small-scale Portrait of Cyril Grigoriev (c.1930) and the larger portrait, My Son (c.1932, whereabouts unknown)....The latter in particular bears similarities to this one; Cyril is depicted as a Classical hero, full-length and shirtless; his well-defined torso muscles are almost identical in both... http://www.sothebys.com/en/auctions/ecatalogue/lot.20.html/2014/important-russian-art-l14114