Create a hyper-realistic, highly detailed oil painting depicting the ancient of days in its final repose. The scene captures a cinematic style with intricate details, showcasing a melding of nature and time in serene harmony. Imagine the landscape enveloped in the soft golden light of a sunset, highlighting the subtle textures and aged features with an ethereal glow. Rendered using advanced visual technologies like Octane and CryEngine, the composition reveals an 8K-level clarity, evoking the craftsmanship of a meticulously detailed sculpture. The artwork should present in a widescreen aspect ratio of 16:8, enhancing its majestic and expansive quality while maintaining the essence of timeless tranquility.