The image shows an engraving of a man depicted from the chest up in a three-quarter view, facing slightly to his left. He maintains an upright posture. His facial features include a prominent nose, high cheekbones, and deep-set eyes beneath furrowed brows, a short, neatly-trimmed beard, and mustache. The man's hair is dark and combed back from his forehead. He is dressed in an elaborate historical outfit typical of a high-ranking individual, featuring a dark, textured garment with a large, intricately ruffled collar. The background is minimally adorned, focusing on the detailed depiction of the figure. The image is framed within an oval border and rests on a textured surface. Latin inscriptions beneath the frame identify him as "Iac. Aug. St. Thuanus."