The central figure is a man in an 18th-century blue coat, white ruffles, and dark breeches, standing as he plays a transverse flute. He is positioned in front of a tall, thin music stand holding an illuminated sheet of music. To his left sits a woman in a pale, voluminous gown on a vibrant red sofa, while to his right, another figure is partially visible in the shadows. The painting features text at the top reading "Adolph Menzel" and "Das Flötenkonzert in Sanssouci."
Set within a grand, opulent interior, the composition is defined by the warm, flickering glow of candles. A large, ornate chandelier hangs in the background, casting highlights on the decorative walls and furniture. The overall palette is dominated by deep browns, shadows, and rich crimsons, contrasted by the bright, concentrated yellow light emanating from the candles and reflected on the faces and clothing of the subjects.
The artwork is a historical oil painting rendered in a realistic, detailed style characteristic of 19th-century academic art. The lighting creates a sense of intimacy and drama, pulling the viewer's focus to the musician and the glowing music stand. The background is intentionally obscured by atmospheric dimness, emphasizing the regal yet private atmosphere of an evening concert at the palace.