His approach to printmaking was characterised by a clear, structural logic. Leenhoff frequently adapted the works of other artists, such as Henri Lehmann, to create engravings of throne room decorations. These works focus on allegorical figures and historical narratives. He maintained a balance between the weight of sculpture and the precision of line work. In his Pierrot series, he placed the traditional commedia dell'arte figure in unexpected settings. These prints use a rabbit or a mill to create a sense of quiet narrative. His portraits, such as the study of his grandmother, Suzanna Leenhoff-van Anholt, show a more personal and direct style.

Modern collectors value Leenhoff for his ability to bring a sense of architectural order to domestic spaces. His prints offer a connection to the Manet circle without the high price of Impressionist oils. The Pierrot series is particularly popular for its clean compositions and whimsical subject matter. These works fit well in rooms that require a sense of history without feeling cluttered. His allegorical scenes provide a formal, classical aesthetic that complements contemporary interior design. The clarity of his engravings ensures that they remain visually effective at various sizes.