He painted both large and small works, but the small ones can fascinate due to the skill used to render small faces and tiny details so convincingly.
I recently came across one such painting in San Francisco's Legion of Honor museum. It is "A Coign of Vantage" (1895). The title might be translated as "A Vantage Nook" -- the word "Coign" referring to a corner. It's 64 cm (25.2 inches) high and 44.5 cm (17.5 inches) wide. This is small, but hardly tiny. Even so, the subjects depicted take up little space: a head in profile is about 5 cm (2 inches) across.
Below are an establishment photo and detail photo featuring the ladies' faces. Click on the images to enlarge considerably (if your screen is large).