Fessard was noted for his ability to replicate the textures of different media through engraving. Whether he was documenting the stone surfaces of tomb sculptures or the movement of a Flemish festival, his technique remained disciplined. He utilised a system of cross-hatching and varying line weights to create depth without relying on heavy ink saturation. This approach allowed him to capture the specific qualities of sculpture and painting while maintaining the clarity required for book illustrations such as "Music" or "The Children of Bacchus".

Modern collectors value Fessard for his technical precision and his role as a visual historian of the Rococo era. His prints offer a window into the theatrical tastes of the French court, from allegorical scenes to royal portraits of Louis XV. These works provide a structured, classical aesthetic that fits well in formal interiors. The clean lines of his engravings ensure that the images remain sharp and legible when reproduced as modern fine art prints.