The painting Portrait of Narcisse Virgile Diaz de la Peña features a seated man, Narcisse Virgile Diaz de la Peña, who is depicted in a thoughtful pose. The color palette is rich, with deep browns and greens that create a warm atmosphere. Diaz is dressed in a dark suit, and his facial expression conveys a sense of introspection.

The background is softly blurred, focusing attention on the subject. In this work, Millet employs oil on canvas to create a lifelike representation of Diaz. The brushwork is detailed, particularly in the rendering of the subject's facial features and clothing. The use of light and shadow adds depth to the composition, enhancing the three-dimensionality of the figure.

The painting measures approximately 60 x 80 cm, making it a medium-sized portrait. Jean-François Millet was known for his depictions of rural life and working-class subjects, but this portrait showcases his versatility as an artist. Painted in the 1860s, it reflects the Realist movement's focus on authenticity and everyday life. An interesting fact about this work is that it captures the likeness of Diaz, a fellow artist and a significant figure in the Barbizon School.

This connection highlights the camaraderie among artists during this period.