In A Duchess (The Blue Dress), Alfred Stevens presents a striking portrait of a woman dressed in a rich blue gown. The dress is adorned with intricate details, showcasing the fabric's texture and the play of light. The background is softly muted, allowing the figure to stand out prominently.

The woman's expression is serene, conveying a sense of dignity and grace. The painting is executed in oil on canvas, a medium that allows for vibrant color and fine detail. Stevens employs a realistic style, capturing the nuances of the fabric and the sitter's features with precision. The use of light and shadow enhances the three-dimensional quality of the figure.

The dimensions of the work are approximately 90 x 120 cm, making it a substantial portrait. Alfred Stevens was known for his ability to depict fashionable women of his time, often focusing on their attire and elegance. This particular work reflects the high society of the late 19th century, emphasizing the importance of fashion in social status. An interesting fact about this painting is that it exemplifies the Realism movement, which aimed to portray subjects in a true-to-life manner, moving away from romanticized representations.