Chasteau is noted for his technical precision with the burin. He often worked after the compositions of Nicolas Poussin and Raphael. His style avoids heavy, cluttered lines common in earlier printmaking. He used clean hatching to define volume and light. In works like The Assumption of the Virgin and Saint Paul Raised to the Third Heaven, he manages to convey a sense of space through controlled tonal shifts. His ability to render the textures of fruit and flowers in the Holy Family shows his range beyond historical subjects.

Modern collectors value Chasteau for his clarity and structural balance. His prints provide a way to own the compositions of the Old Masters in a format designed for the home. The monochrome palette of his engravings fits well with contemporary interior design. These works offer a sense of historical continuity without the visual weight of a large oil painting. They are technical studies in light and shadow that remain clear and legible on a wall.