Generate a medium close-up portrait of a distinguished Victorian gentleman. He is impeccably dressed in a dark velvet tailcoat, a rich silk brocade waistcoat with intricate patterns, and a crisp white cravat. He wears a polished black silk top hat and holds a gleaming gold-rimmed monocle. The background depicts a misty London cobblestone street at dusk, illuminated by the warm, flickering glow of ornate gas lamps, casting atmospheric shadows. Ensure the image captures a photorealistic quality with a painterly depth, reminiscent of 19th-century portraiture, highlighting the textures of the clothing and the ethereal lighting.