In Charlotte Moser, Schwester des Künstlers, the viewer sees a woman portrayed with soft, flowing lines typical of the Art Nouveau style. The color palette features warm earth tones, with subtle hints of greens and blues that create a serene atmosphere. Charlotte Moser's expression is calm and introspective, inviting the viewer to ponder her thoughts.

The background is minimal, allowing the focus to remain on her figure and the delicate details of her attire. The painting is executed in oil on canvas, showcasing Koloman Moser's skill in blending colors and textures. The brushwork is fluid, contributing to the overall sense of movement in the piece. Viewers can observe the intricate patterns in Charlotte's clothing, which reflect the decorative elements of the Art Nouveau movement.

The dimensions of the painting are approximately 60 x 80 cm, making it a moderately sized portrait. Koloman Moser was a prominent figure in the Vienna Secession movement, known for his contributions to graphic design and decorative arts. This portrait of his sister, Charlotte, is a personal work that highlights his ability to capture the essence of his subjects. An interesting fact about this painting is that it reflects Moser's commitment to integrating art with everyday life, a hallmark of the Art Nouveau movement.

The work exemplifies the intimate connection between the artist and his family, showcasing a blend of personal and artistic expression.