A dramatic, painterly illustration for an audiobook cover, square 1024x1024. The scene depicts a vast, rugged mountain landscape at twilight. In the foreground, a lone, ancient pine tree with gnarled branches stands silhouetted against a sky ablaze with deep oranges, purples, and fiery reds. A shimmering, almost ethereal silver lake is visible in the middle ground, its surface reflecting the dramatic sky. Wisps of mist curl over the water and the rocky terrain. The overall mood is mysterious, adventurous, and slightly melancholic, evoking the spirit of classic Western tales and hidden treasures. The visual style should be reminiscent of romantic landscape paintings, with a focus on atmosphere and light, but rendered with a modern, clean aesthetic suitable for a book cover. No text or logos whatsoever.