A formal portrait of the Antwerp merchant Sebastiaan Leerse, painted by the Dutch artist Willem Bartel van der Kooi with a focus on realism and texture.

This portrait by Willem Bartel van der Kooi depicts Sebastiaan Leerse, a merchant based in Antwerp. Van der Kooi, a Dutch painter active during the late eighteenth and early nineteenth centuries, was known for his technical precision and his ability to capture the social standing of his subjects. The sitter is presented in a formal, three-quarter view, dressed in dark, sober attire that reflects the professional status of a merchant during this period.

The composition is restrained, focusing the viewer's attention on the sitter's facial expression and his posture. The large, white ruff collar provides a stark contrast to the dark fabric of his coat, a stylistic choice that draws inspiration from seventeenth-century Dutch portraiture. Van der Kooi employs a muted palette, relying on subtle gradations of shadow to define the form of the figure against a neutral, architectural background. The lighting is soft, directed primarily at the face and the hand holding a glove, which adds a sense of tactile realism to the work.

Van der Kooi's approach to portraiture often involved a careful balance between naturalism and the formal requirements of the genre. In this piece, the artist avoids unnecessary ornamentation, allowing the character of the merchant to emerge through the details of his features and the deliberate placement of his hands. The painting demonstrates the artist's skill in handling oil paint to render different textures, from the delicate lace of the collar to the heavier weave of the outer garment. This work remains a representative example of the portrait tradition in the Netherlands during the early nineteenth century, documenting the appearance and professional identity of the mercantile class.