In Anna Maria Brodeau Thornton (Mrs. William Thornton), Gilbert Stuart presents a detailed portrait of a woman in a dark dress adorned with a white collar. The background is a soft, muted color that highlights the figure, drawing the viewer's attention.

The use of light and shadow creates depth, emphasizing the contours of her face and the fabric of her clothing. The overall color palette is rich yet subdued, conveying a sense of dignity and grace. This painting is executed in oil on canvas, a common medium for portraits during the late 18th century. The dimensions are approximately 76 x 63 cm, making it a sizable work that allows for intricate details in the subject's features.

The brushwork is precise, showcasing Stuart's skill in rendering textures, particularly in the fabric and skin tones. The portrait captures not just the likeness of Mrs. Thornton but also her character, a hallmark of Stuart's portraiture. Gilbert Stuart was a prominent American painter known for his portraits of early American leaders, including George Washington.

This particular work, created in the 1790s, reflects the Colonial American style, which often emphasized realism and character. An interesting fact about this painting is that it is part of a larger tradition of portraiture that sought to document the emerging American identity during a time of great change. Stuart's ability to capture the essence of his subjects has made this work a notable example of American art.