In Portrait of Jacob de Witt, the subject is depicted in a dignified pose, dressed in dark, elegant clothing. The background is a muted, neutral tone that emphasizes the figure. The use of light and shadow creates a sense of depth and realism.

The colors are rich yet restrained, typical of the Dutch Golden Age style. The painting is executed in oil on canvas, a common medium for portraits during this period. Maes employs a realistic approach, capturing the details of Jacob de Witt's attire and facial features. The brushwork is smooth, allowing for a lifelike representation of the subject.

The dimensions are approximately 80 x 100 cm, making it a substantial work. Nicolaes Maes was a prominent artist of the Dutch Golden Age, known for his portraits and genre scenes. This particular work showcases his ability to convey personality through facial expression and posture. An interesting fact about this painting is that Jacob de Witt was a notable figure in Dutch politics, serving as the mayor of Amsterdam.

Maes' portrayal reflects the importance of status and character in 17th-century Dutch society.