At Mouquin's by William Glackens is a lively painting that captures a scene at the renowned New York restaurant, Mouquin's. The artwork depicts a group of well-dressed patrons enjoying their time at the establishment, showcasing Glackens’ skill in rendering urban life with vibrancy and warmth.

Glackens’ use of color and composition reflects the bustling atmosphere and social dynamics of the early 20th-century New York dining scene. The painting provides a snapshot of city life and the pleasures of socializing in a fashionable setting.