His artistic style is defined by an imaginative handling of light and space. Unlike the darker, more rigid compositions of his predecessors, Rottmayr introduced a sense of movement and weightlessness to his figures. His work on Jupiter and Hebe demonstrates this shift toward a more atmospheric quality. He often prepared his large-scale frescoes with oil sketches that retained a sense of immediacy. These smaller studies reveal his ability to organise complex mythological and religious scenes with a clear sense of balance.

Modern collectors value these works for their historical position between the high Baroque and the early Rococo. The compositions provide a sense of theatrical scale that remains accessible in a domestic setting. Prints of his religious subjects, such as the Deposition from the Cross, offer a look at the technical precision of the Austrian school. His art provides a window into a period when central European painting established its own distinct identity.