Pelgrom worked within the Dutch Romantic tradition but maintained a clear, observational style. His Winterlandschap compositions avoid the overly sentimental tropes common in nineteenth-century snow scenes. He used cool tones and structured arrangements to depict the stillness of the Dutch countryside. His self-portrait, Zelfportret van Jacobus Pelgrom, shows a direct gaze that suggests a preference for honesty over flattery.

The appeal of Pelgrom's work lies in its balance of historical documentation and atmospheric calm. His prints provide a window into the Dutch Golden Age revival that occurred during his lifetime. These works suit contemporary interiors because they offer a sense of quietude. Collectors value the technical precision found in his figure studies, such as Krijgsman met getrokken zwaard, which demonstrates his skill in anatomical drawing.