The image depicts a man from the waist up. He is seated with his body facing slightly to the left while his head is turned toward the viewer, creating a three-quarter view. The man has long, curly hair that extends past his shoulders, a prominent nose, and calm eyes. He is wearing a dark, long-sleeved garment with a white cravat around his neck. The background features an ornate frame with an oval shape enclosing the portrait and a rectangular plaque below it identifying him as Sir William Trumbull, Principal Secretary of State to King William III.