His approach relied on the precision of the burin to replicate the tonal variations of oil paintings. Fortier avoided the decorative excesses of the earlier Rococo style. Instead, he adhered to the Neoclassical preference for clarity and order. By using disciplined line work, he captured the solemnity of ancient sculpture and the structured compositions of his contemporaries. His prints were technical translations that prioritised the purity of form over sensory ornamentation.

Modern collectors value Fortier for the architectural quality and monochromatic balance of his engravings. These prints suit contemporary interiors because they provide a sense of historical weight without overwhelming a room with colour. The focus on classical themes and clean lines makes his work compatible with minimalist or traditional decor. His prints offer a direct connection to the intellectual rigour of the nineteenth-century French Academy.