The artist did not limit his output to military subjects. He also painted quiet scenes of domestic labour. His work Stoelenmatters in een schuur aan het werk depicts craftsmen at their trade. Keultjes used a realistic style typical of the Dutch school. He avoided the drama of Romanticism. Instead, he preferred to show the physical reality of his subjects. His use of light and shadow helps define the shapes of the figures and the textures of their tools.

Modern collectors value Keultjes for his versatility. His prints offer a choice between historical drama and peaceful interior scenes. The naval works suit large spaces that require a sense of scale. The domestic scenes provide a connection to traditional Dutch life. These images work well in homes that appreciate historical accuracy. His short career makes his surviving designs a specific window into the early 1800s.