His technique relies on a controlled use of line and light. While his early output focused on the human figure and classical compositions, Wiertz also applied this analytical eye to his surroundings in Nijmegen. He captured local landmarks such as the Belvédère with the same precision he applied to his award-winning anatomical drawings. His studies of shells and sea plants demonstrate a shift towards scientific observation. He avoids dramatic flourishes. Instead, he presents his subjects with a clarity that prioritises structural accuracy over decorative effect.

Collectors today value Wiertz for the quiet authority of his work. His drawings of shells and marine life possess a clean, graphic quality that suits contemporary spaces. The academic nudes provide a sense of historical weight without appearing cluttered. These prints offer a balance of technical skill and natural clarity. They are effective additions to a curated home gallery.