Create a captivating composite sketch from the early 1970s that captures the atmosphere and style of that era. The image depicts a mysterious figure in a sleek, slim-cut suit with a wide collar and a bold pattern reminiscent of famous detectives from that time. The distinctive mustache and sunglasses give the character a mysterious aura, while the wild, curly hair in the 70s style exudes a touch of rebellion and nonconformity. In the background, there is a dimly lit, smoky bar with retro decor bathed in warm, muted light, evoking a nostalgic mood. The figure casually holds a cigarette, embodying an enigmatic character from a classic crime novel of that era.