A square 1024x1024 AI-generated image for a professional audiobook cover. The artwork should evoke a vintage, slightly melancholic, and whimsical mood, reminiscent of early 20th-century New York City. The central imagery should be a single, slightly worn, ornate antique pocket watch resting on a cracked, weathered wooden surface. Subtle, ethereal wisps of smoke or mist should curl gently around the watch, suggesting hidden stories and fleeting moments. The overall color palette should be muted and warm, with dominant tones of sepia, deep ochre, faded teal, and hints of dusty rose. The lighting should be soft and diffused, creating a sense of mystery and quiet introspection, with subtle shadows that add depth. The composition should be balanced and visually appealing, with the pocket watch as the clear focal point, rendered with fine detail. The aesthetic should feel like a captured memory or a hidden treasure, without any text or logos.