Roses and a Tulip in a Glass Vase

The style of Van Thielen's flower pieces is less spontaneous than that of his master Daniel Seghers. Each flower stands out individually rather than blending into the composition as a whole. In his flower paintings he demonstrated his skills as a colourist, which contributed to his commercial success. An example is the Roses and a tulip in a glass vase in the National Gallery of Art in Washington.