His work is defined by the goût grec. This style rejected the curves of the Rococo for something more muscular. Delafosse used heavy garlands and classical masks to create a sense of architectural weight. His designs for clocks, such as the Ontwerp voor de kast van een staand horloge, often include dolphins or stars. These engravings were intended as patterns for craftsmen. They stand alone as balanced compositions.

Modern collectors value Delafosse for his technical precision and use of symmetry. His etchings, such as Neo-classicistische vazen in een landschap, offer a structured aesthetic that fits well in minimalist or classical interiors. The monochrome nature of these etchings provides a neutral decorative element. These etchings represent a moment when French design turned toward the order of antiquity.