In Girls on a Dune, Léon Spilliaert presents two young girls standing on a sandy dune. The painting features a muted color palette dominated by soft browns and blues. The girls are dressed in light clothing, and their hair flows gently in the breeze.

The setting evokes a sense of calmness and intimacy, with the vast sky and distant horizon adding depth to the scene. The painting is executed in oil on panel, a medium that allows for rich texture and detail. Spilliaert's brushwork is delicate, capturing the softness of the girls' clothing and the fine grains of the sand. The composition is balanced, with the figures positioned thoughtfully against the expansive background.

The use of light and shadow enhances the overall atmosphere of the piece. Léon Spilliaert was a Belgian Symbolist artist known for his introspective and atmospheric works. This painting reflects his fascination with the interplay of light and nature. Interestingly, Spilliaert often painted solitary figures in landscapes, which can be seen in this work.

Girls on a Dune exemplifies his ability to convey emotion through simple yet profound imagery.