La sérieuse features a young woman with a serious expression, her gaze directed slightly off to the side. The artist employs a soft color palette dominated by warm skin tones and muted background hues. The woman's hair is styled elegantly, framing her face and adding to her dignified appearance.

The overall composition is intimate, drawing the viewer's attention to her thoughtful demeanor. The painting is executed in oil on canvas, a medium that allows for rich detail and texture. Bouguereau's technique is characterized by smooth brushwork and a focus on realistic representation.

The dimensions of the artwork are approximately 60 x 80 cm, making it a medium-sized portrait. The careful rendering of light and shadow enhances the three-dimensionality of the figure. William Bouguereau was a prominent French painter known for his academic style and focus on the human figure. La sérieuse reflects his mastery in portraying emotion and character through facial expressions.

Interestingly, this work showcases Bouguereau's ability to blend realism with idealized beauty, a hallmark of his artistic approach. The painting remains a testament to the academic traditions of the late 19th century.