In Portrait of mayor Liebaert, Léon Spilliaert presents a somber figure against a dark background. The mayor is depicted in formal attire, with a serious expression that conveys authority. The color palette is dominated by deep blues and blacks, enhancing the mood of the piece.

The use of light subtly highlights the contours of the mayor's face, drawing the viewer's attention to his gaze. The painting is executed in oil on canvas, a medium that allows for rich texture and depth. Spilliaert's brushwork is meticulous, capturing the fine details of the mayor's clothing and facial features. The dimensions are approximately 60 x 80 cm, making it a medium-sized portrait that invites close inspection.

The composition is balanced, with the figure centrally placed, emphasizing the subject's importance. Léon Spilliaert was a Belgian artist known for his Symbolist style, often exploring themes of solitude and introspection. This portrait of Mayor Liebaert reflects Spilliaert's interest in the psychological depth of his subjects. Interestingly, the work was created during a time when Spilliaert was gaining recognition for his unique approach to portraiture.

It remains a significant example of early 20th-century Belgian art.