His lithographs focus on the social habits of the Parisian elite and the emerging financial class. In works like Aristocratie Financière and Before Dinner, he uses a clean line to document the vanity of his contemporaries. He avoided the heavy distortion often found in political caricature. Instead, he relied on the comedy of social interaction and the awkwardness of formal gatherings. His background in theatre gave him a unique ability to arrange figures within a single frame.

Modern collectors value Monnier for his dry wit and his role as a social historian. His prints provide a clear window into nineteenth-century manners without the heavy moralising of earlier satirical art. The compositions are balanced and legible. They are well-suited for contemporary rooms that require a sense of history. Pieces such as Fantastic Dance show his ability to find humour in the rigid structures of society.