His artistic approach focused on the harmony between human figures and their surroundings. In The Virgin in a Landscape, Rahl avoids the dramatic theatricality of the Baroque period. Instead, he uses a structured Neoclassical style that prioritises balance. This is evident in Presentation in the Temple, where the placement of figures creates a sense of stillness. His work often features religious subjects like Holy Night or Christ with the Samaritan Woman at the Well. These pieces use soft light to define the space rather than relying on harsh contrasts.

Modern collectors find value in Rahl's work because of its calm and orderly aesthetic. The clear compositions provide a sense of stability that works well in contemporary interiors. His prints offer a connection to the Viennese academic tradition without the heavy ornamentation found in later periods. These works represent a period when artists sought to find a middle ground between strict classicism and the early stirrings of Romanticism.