Create a chilling and horrifying depiction of a post-apocalyptic world overrun by relentless, decaying zombies. Show the desolation of once-thriving urban landscapes now in ruins, with eerie moonlight casting long shadows. Highlight the grotesque, decaying features of the zombies, their tattered clothing, and hunger-filled eyes. Convey a sense of impending doom as survivors desperately fight to stay alive, using any means necessary. The atmosphere should be tense and fear-inducing, with attention to gruesome details, emphasizing the horror of the undead menace. Make this digital artwork an immersive experience that captures the essence of a zombie apocalypse, evoking terror and unease in the viewer.