In St. Andrew, Jacob Jordaens presents a striking figure of the saint, draped in rich, deep colors. The background is dark, which enhances the luminosity of the figure.

St. Andrew is depicted holding a cross, symbolizing his martyrdom. The overall composition is dynamic, drawing the viewer's eye toward the central figure. The painting is executed in oil on canvas, typical of the Baroque period.

Jordaens employs chiaroscuro, the contrast of light and shadow, to create depth and drama. The textures of the fabric and the saint's skin are rendered with great attention to detail. This technique adds to the lifelike quality of the figure. Jacob Jordaens was a prominent Flemish painter of the Baroque era, known for his vibrant colors and robust figures.

This work reflects his mastery of depicting religious subjects with emotional intensity. An interesting fact about St. Andrew is that it showcases Jordaens' ability to blend realism with dramatic expression, making it a notable piece in his oeuvre.