Roth focused on the structure of trees and the movement of water. His painting Boomstudie shows his interest in botanical accuracy. He often travelled to Germany to paint the forests around Bentheim and the Ruhr river. He used a precise technique to capture light on leaves and the surface of rivers. His compositions often balance natural elements with man-made structures like Kasteel Soelen. These works show his technical skill with perspective and light.

Modern collectors value Roth for his direct observation of the environment. His paintings avoid the sentimentality found in other nineteenth-century art. The paintings provide a clear view of the Dutch and German countryside from a past era. They offer a sense of order and calm. These prints suit interiors that require a traditional yet honest aesthetic. The clarity of his work makes it suitable for contemporary homes.