Browne is best known for his work in mezzotint, a technique that allows for tonal gradations rather than simple lines. He published numerous plates after portraits by Anthony van Dyck and Peter Lely. His prints of figures like King Charles I and Henrietta Maria capture the textures of fabric and skin through careful burnishing of the copper plate. This method allowed him to reproduce the effects of oil paintings with a precision that earlier woodcuts or engravings could not achieve.

Collectors today value Browne for his ability to translate the formal portraiture of the Stuart court into a smaller, more accessible format. His depictions of historical figures such as Cornelis Tromp or Thomas Wentworth provide a direct link to the visual culture of the seventeenth century. These prints offer a sense of historical continuity and formal balance. They work well in contemporary interiors that favour monochrome palettes or traditional portraiture.