His artistic approach focused on the structural elements of the environment. Bertin rejected the soft, hazy style of many of his peers. He preferred to define the sharp edges of rocks and the geometry of ruins. Many of his works are oil sketches or drawings that use a restrained palette. This method allows the viewer to see the underlying form of the earth. His work is often categorised as historical scenery.

These works appeal to modern collectors because of their architectural quality. The clear lines and muted colour schemes fit well in minimalist rooms. Bertin provides a sense of permanence and stability through his art. His prints offer a sophisticated way to bring nature into a home without using overly bright or sentimental imagery. They function as quiet pieces that reward close observation.