His work is defined by a mastery of perspective and architectural detail. Herz often depicted vast interior spaces, such as cathedrals and palaces, using a technique that emphasised depth through mathematical precision. He frequently employed multiple copper plates to create oversized prints that captured the scale of Baroque architecture. These prints are notable for their clarity and the way they organise complex decorative elements into a coherent visual structure.

Modern collectors value these prints for their technical rigour and formal balance. The monochrome nature of his engravings allows the structural beauty of the architecture to remain the primary focus. These prints provide a sense of order and historical continuity in contemporary interiors. His large-scale views of European cities and religious sites offer a window into the urban planning and aesthetic priorities of the mid-eighteenth century.