His approach combined Baroque drama with the lighter touch of the Rococo period. In works such as Nymphs Bathing Near a Cave and The Adoration of the Shepherds, he used light and colour to create focus without relying on heavy shadows. He concentrated on technical precision and the physical properties of paint. This versatility meant he could move from the religious gravity of Deacon Philip Baptising the Eunich to the satirical tone of Surprised, or Infidelity Found Out with ease.

Modern collectors value Dietrich's prints for their historical range and decorative adaptability. A single artist provides access to multiple classical traditions through an 18th-century lens. Pieces like Landschap met tunnel door een rotspartij or St. William, The Hermit Saint offer a sophisticated aesthetic that fits well in traditional or eclectic rooms. His work provides a sense of continuity with the history of European painting without requiring the viewer to choose a single school of art for their walls.