The painting being subject of the story, is titled After the Bath (1888) by Pierre-Auguste Renoir.
Part of a four movies cycle called "alta tenzione" (High tension) produced for television, consisting of Il maestro del terrore (aka The Prince of Terror, 1988), L'uomo che non voleva morire (aka The Man Who Didn't Want to Die, 1988), Il gioko (School of Fear, 1989) and Testimone oculare (aka Eyewitness, 1989).