He has developed a preference for painting flower still lifes. Creating a good composition and making preliminary drawings takes enormous concentration. Setting up and drawing the composition takes almost as much as the making of the actual painting itself. The focus on developing paintings with attention to the most minute details, including attention to the detailing of water drops, insects, and leaves. The high level of detail is also apparent in his portraits, clearly perceptible in the eyes, the lips, and especially the hands of his subjects. With such attention to detail, created with layer after layer or carefully applied oil colors, Jeroen's still lifes have an almost photographic realism.