Create an ultra-realistic Halloween-themed wallpaper that exudes a sense of eerie mystery. The scene should be set in a dark, foggy forest at night, illuminated only by a pale, ghostly moon. Include twisted trees with gnarled branches reaching out like skeletal hands, and patches of fog creeping along the forest floor. In the foreground, add a spooky old gravestone, partially covered in moss, with an inscription that reads "Rest in Peace." Surround the gravestone with scattered autumn leaves and glowing jack-o'-lanterns, their carved faces casting flickering shadows. In the background, hint at shadowy figures that seem to watch from the darkness, creating a sense of unease. The color palette should consist of deep blacks, muted grays, and pops of orange from the pumpkins, enhancing the overall chilling atmosphere