His work is defined by a rigorous study of nature, particularly the structure of trees. Works such as Pine Trees and Bridge demonstrate his ability to translate complex botanical forms into clear, balanced compositions. He often used tinted paper or multiple stones in lithography to create a sense of depth without relying on heavy colour. His portfolio includes views of English estates like Blickling Hall and Moreton Hall, alongside European scenes from his series Sketches at Home and Abroad, capturing architectural details with precision.

Modern collectors value Harding for his clean lines and his ability to balance technical accuracy with atmosphere. His prints of Italian scenes like Trento and Riva Lago di Garda offer a calm, structured view of the European grand tour. These works provide a sense of historical place that fits well in contemporary interiors. The muted tones and focus on form make his lithographs versatile pieces for a collection.