His technique relied on a distinctive use of the reed pen. He created broken lines to suggest the decay of Gothic buildings. This method avoided the clean lines of traditional architectural drafting. Prout focused on the character of the street scene rather than just structural dimensions. His lithographs used these marks to give weight to shadows and texture to weathered stone. He often included small figures in local dress to provide a sense of scale.

Collectors value Prout for his ability to document a version of Europe that has largely vanished. Many of the buildings he drew in Cologne and Rouen were later destroyed. His prints offer a factual record of medieval urbanism. The monochromatic nature of his lithographs and the clarity of his pen work suit contemporary interiors. These pieces function as historical documents that maintain a graphic quality on a wall.