His own work, such as The Solferino Bridge: Nocturnal Effect and Rue du Mont Cenis, demonstrates a mastery of atmosphere and light. Delâtre used the aquatint process to create washes of colour that resemble watercolours. He often chose subjects from his immediate surroundings in Paris or the rural quiet of Brittany. His prints of the Moulin de la Galette or the Old Mill at Plouezac avoid the frantic energy of the era. Instead, they focus on steady compositions and the subtle interplay of shadow.

Modern collectors appreciate Delâtre for his ability to balance technical precision with a quiet, domestic mood. His prints do not demand attention through loud colours or grand themes. They offer a calm, historical perspective on French life that fits easily into a contemporary home. His portraits, including those of the writer J. K. Huysmans, show a directness that remains fresh. These works provide a connection to the Montmartre art scene through the eyes of a man who helped build its reputation.