His work focuses on architectural precision and atmospheric light. In pieces such as Beverley Minster and the Cathedral Church of Peterborough, Lewis used fine lines to define Gothic stonework. He avoided the heavy tones common in earlier engravings. Instead, he employed a light touch that preserved the clarity of the original sketches. This method allowed him to capture the specific textures of Yorkshire stone or the skies over the Norfolk countryside with accuracy.

Modern collectors value these prints for their clean geometry and historical detail. The architectural studies of Norwich and Peterborough offer a sense of permanence and order. These works function as both artistic expressions and records of the British built environment. The neutral palette and formal compositions of the Liber Studiorum series suit contemporary interiors that favour clarity over ornamentation.