His approach relied on a disciplined use of cross-hatching and varying line weights to simulate the texture of skin and stone. In works like Perseus and Andromeda, Jacoby demonstrates the Prussian school's preference for clear outlines and balanced compositions. He avoided the loose brushwork popular in other parts of Europe, choosing instead the permanence and clarity of the burin. This method allowed for a high degree of detail that remains sharp even in modern reproductions.

Modern collectors value Jacoby for the architectural quality of his figures and the stillness of his scenes. His work provides a sense of order and classical proportion that fits well in minimalist or traditional interiors. The monochromatic nature of his engravings allows the viewer to appreciate the pure form of the subject without the distraction of a varied colour palette.