In Sketch of nude male to the painting ‘Martyrdom of St. Matthias’, we see a male figure depicted in a naturalistic pose. The artist uses a muted palette, primarily in shades of brown and gray, to emphasize the form of the body.

The figure is rendered with careful attention to anatomical details, showcasing the muscles and contours. The background is minimal, allowing the focus to remain on the figure itself. The sketch is executed with pencil on paper, showcasing Simmler's skill in figure drawing. The lines are fluid and dynamic, capturing the essence of the human form.

Viewers can observe the artist's technique in the shading and contours, which add depth to the figure. This work serves as a preparatory study for the larger painting, indicating the artist's methodical approach. Józef Simmler was a Polish artist known for his academic style and focus on historical subjects. This particular sketch is interesting as it reveals the preparatory process behind a significant religious painting.

The Martyrdom of St. Matthias was likely intended for a church, highlighting the importance of religious themes in Simmler's work. Such sketches were common practice among artists of the time, serving as a bridge between concept and final execution.