"Generate a realistic portrait image of Louis IV, Grand Duke of Hesse, in a formal 19th-century military uniform, with the insignia of a General of Infantry, standing in front of a backdrop that includes elements symbolic of the House of Hesse-Darmstadt, such as the Hessian coat of arms or the Darmstadt palace, incorporating a solemn and authoritative demeanor reflective of his reign from 1877 to 1892."