In Study for the Portrait of Marie De Coster, the Artist’s Wife, the viewer is greeted by a warm palette of earthy tones. The figure of Marie De Coster is depicted with soft brush strokes that capture her gentle demeanor. She is seated, dressed in a simple yet elegant gown, which reflects the artist's intimate connection to her.

The background is subtly rendered, allowing her presence to dominate the composition. The painting employs oil on canvas, a medium that allows for rich texture and depth. The brushwork is fluid, suggesting a sense of movement and life in the portrait. The use of light and shadow enhances the three-dimensionality of Marie's figure, creating a lifelike representation.

This study likely served as a preparatory work for a more finished portrait. Gustave Vanaise was known for his realistic portrayals, often focusing on intimate subjects. This particular work highlights his affection for his wife, Marie, and reflects the domestic life of the artist in the late 19th century. An interesting fact about this painting is that it was created as a study before a larger, more formal portrait, showcasing Vanaise's dedication to capturing the essence of his subjects.