His approach to portraiture was methodical and formal. Pfann used fine lines to define the texture of lace collars and heavy wool garments. In works like the Portrait of Johann Saubert I or Ambrosius Bosch, he positioned subjects behind stone sills or within oval frames. This framing device creates a sense of physical distance between the viewer and the subject. He avoided excessive ornamentation. He chose to focus on the facial features and the status symbols of the German merchant and clerical classes.

Modern collectors value these prints for their crisp monochromatic aesthetic. The sharp contrast of black ink on paper fits well in contemporary interiors that favour a minimalist or historical palette. His portraits, including those of Johann Ferber and Johannes Vennitzer, offer a direct connection to seventeenth-century European history. They are clear examples of the skilled craftsmanship found in early printmaking.