Although Luks is most well known for his depictions of New York City life, he also painted landscapes and portraits and was an accomplished watercolorist. His visual perception was acute, no matter the genre, the art critic Sadakichi Hartmann noted. In later years, he painted society portraits (e.g., "Society Girl"). His style was not uniform throughout his career, though. "The Cafe Francis" (1906) contains more impressionist touches than his usual dark scenes of lower-class urban life, and his interest in documentary accuracy varied. "Sulky Boy" (1908), for example, depicts the son of a doctor at Bellevue Hospital who treated Luks for alcoholism, but it has been noted that Luks was more concerned with depicting the boy's demeanor than conveying an authentic representation of the surroundings.