His technique relied on a disciplined use of line to convey volume and texture. Duflos avoided the soft, hazy effects common in Rococo engravings. Instead, he used clear hatching and cross-hatching to define the weight of marble and the depth of carved relief. This methodical approach made his engravings essential for architectural catalogues. He captured the specific details of funerary monuments, such as the Sarcophagus of Petrus a Ponte Salubri, with a clarity that prioritised structural accuracy over decorative flourish.

Modern collectors value Duflos for the architectural stillness and historical weight of his engravings. His work functions as a window into the formal history of European design. These engravings suit contemporary interiors that favour monochrome palettes and clean lines. Because they focus on classical and medieval forms, they offer a sense of permanence and order. These engravings remain an excellent choice for those who appreciate the technical skill required to render stone and shadow on paper.