His artistic method involved a rigorous study of nature. In Boomstudie, he recorded the physical characteristics of individual trees with botanical precision. He preferred clear light that defined the shape of branches and the density of leaves. Many of his scenes, such as Gezicht op Rhenen, use a low horizon to emphasise the sky. He often included small human figures to provide a clear sense of scale within the environment.

Modern collectors appreciate the restrained quality of his work. Eymer did not rely on theatrical effects or bold colour palettes. His prints provide a sense of stillness. They work well in homes where the goal is to create a composed atmosphere. The factual nature of his drawings makes them useful additions to a collection of 19th-century art.