In Prayer in the mosque, Rudolf Ernst depicts a tranquil scene inside a mosque. The painting features rich colors, with deep blues and golds dominating the interior. Figures are seen engaged in prayer, their postures reflecting devotion and peace.

The intricate details of the mosque's architecture enhance the spiritual atmosphere of the artwork. The painting is executed in oil on canvas, showcasing Ernst's attention to detail and use of light. The textures of the fabrics worn by the figures are rendered with precision, adding depth to the scene. The composition draws the viewer's eye towards the central figures, creating a focal point of worship.

The overall harmony of colors contributes to the serene mood of the piece. Rudolf Ernst was known for his Orientalist works, often portraying scenes from the Islamic world. This painting reflects his fascination with Islamic culture and architecture. An interesting fact about this work is that it captures not just a moment of prayer, but also the beauty of the mosque's design.

Ernst's ability to blend cultural elements with artistic technique makes this piece notable.