Portrait of a fearless tribal man standing amidst the ruins of a post-apocalyptic city reclaimed by dense, vibrant greenery, inspired by the styles of Luis Royo and Greg Rutkowski. The atmosphere is dark and gritty, with exquisite detail and intricate elements. Volumetric lighting and mist create a rich, immersive environment. This concept art, ideal for a compelling cover illustration, emulates the high-quality finish of an octane render. It's trending on art platforms, rendered in stunning 8k resolution, capturing the tribal man's dynamic pose. The image is free of any text, watermarks, artist names, or copyright markings.