A Japanese black-and-white manga style, with the depth of a psychological suspense work. The brushwork is delicate, adept at using rich screen tones and ambient light and shadow to set the mood of the character's inner world. Use a straight-on or slightly high-angle perspective with a relatively casual composition. The detective might be leaning relaxedly against a wall or a bookshelf, hands in his jeans pockets. His posture is very relaxed, almost lazy, creating a contrast with his intellectual victory. Light, Shadow, and Atmosphere: 1. The light is "environmental and fragmented." The light may come from multiple sources like a window and a desk lamp, creating complex, dappled light and shadow on his face and body. This symbolizes how he has untangled the chaotic threads of clues. 2. The shadow is "narrative." The shadow on his face is not a solid block of black but is drawn with fine hatching or layered screen tones of different gray values. The shadow cleverly outlines the smile on his lips, making it appear more cunning and meaningful. The background behind him (like a messy office, bookshelves) is mostly in shadow, suggesting that these complex problems have been left behind him. 3. Texture and Details: * **Attire**: The jacket might be made of a soft fabric with natural folds. The fading and creases on the jeans are meticulously drawn. The leather shoes may not be as shiny, appearing more lived-in, but are still neat. * **Expression**: His gaze is not directed at the camera but looks diagonally downward, as if he is reliving his reasoning process. On his face is the signature "smug" smile, a genuine pleasure akin to a successful prank. 4. Compositional Tension: The tension comes from the "contrast between a static posture and internal ecstasy." His outward appearance is calm and relaxed, but the light, shadow, and subtle expression expose the immense satisfaction within. This atmosphere is more like "a hunter quietly watching his prey walk step by step into the trap he set"—a private, intellectual pleasure.