The image depicts a portrait of Mrs. Montagu, focusing on her head and upper torso. She is sitting in profile, facing to the right side of the image. Her facial features are delicate, with a prominent nose and finely arched eyebrows, and her hair is styled in a sophisticated updo with a lace-trimmed cap or head covering. She is wearing an elegant dress with intricate lace details visible on the sleeves and front, complemented by a large bow at the neckline. A pair of earrings is visible as her only jewelry. The background features a softly textured curtain and possibly furniture.