In works such as Alpheus and Arethusa, Waterloo places mythological figures within a dominant natural setting. He used a combination of etching and engraving to create deep shadows and varied textures. He is particularly noted for his studies of oak and beech trees. These works show the effects of weather on bark and foliage. Because he focused on the environment, he frequently asked other specialists to add the figures to his scenes. This collaborative method ensured that the natural elements remained the primary subject of each composition.

Collectors today value Waterloo for his direct observation of the natural world. His prints offer a quiet, atmospheric quality that fits well in modern interiors. The monochromatic nature of his etchings provides a graphic clarity that works with various decor styles. These pieces function as windows into a seventeenth-century forest. They provide a sense of calm through their balanced compositions and attention to botanical detail. His ability to capture the weight of a branch or the density of a thicket remains effective centuries later.