His etchings reflect his architectural training through precise line work and a focus on structural form. Works like Latin Quarter and the Woolworth Building demonstrate his ability to capture the scale of urban environments. He used a controlled needle to define the geometry of buildings while maintaining atmospheric depth. His prints of Mont Saint Michel and Chamonix show how he applied this same structural rigour to natural scenery. He relied on the clarity of the etched line to convey the character of a place.

Plowman's prints appeal to modern collectors who value clean lines and architectural history. His work provides a window into early twentieth-century cities and European sites like Capri or the Boat Builder's Yard. The monochromatic nature of his etchings fits well in contemporary interiors. These prints offer a sense of order and historical perspective. They are suitable for those who appreciate the technical skill required to translate complex buildings into a graphic format.