His approach relied on a disciplined use of line to mimic the effects of light and shadow. In works like "Hebe with the Eagle" and "The King Drinks", Krüger used varying weights of strokes to define form. He avoided the heavy, dark areas common in earlier prints. Instead, he preferred a balanced distribution of grey tones. This technique allowed him to capture the softness of a "Madonna and Child" or the drama of "The Death of Clorinda" with precision.

Modern collectors value these prints for their technical clarity and historical context. The monochrome nature of his engravings allows them to fit into various interior styles without clashing with existing colour schemes. Krüger's work offers a way to appreciate the compositions of the old masters through the lens of a skilled eighteenth-century craftsman. These pieces provide a direct link to the academic traditions of Dresden.