His artistic approach involves a stripped-back observation of the everyday. In works such as Spitskool or Badhokjes (Noordwijk), he isolates his subjects against neutral backgrounds. This technique forces the viewer to consider the geometry and texture of a common cabbage or a row of beach huts. His lines are deliberate and certain. He avoids unnecessary detail, preferring to capture the essence of a scene through strong silhouettes and a controlled palette.

Collectors of modern prints value Dool for his ability to find interest in the mundane. His depictions of Spanish locations such as Huesca and Castro Jeriz offer a quiet, architectural perspective on the world. The work is direct and lacks sentimentality. These prints suit contemporary homes where clean compositions and a sense of calm are desired. His art is a study in looking closely at the world without the need for exaggeration.