Design a book cover that captures a post-apocalyptic Earth now ruled by humanoid

Design a book cover that captures a post-apocalyptic Earth now ruled by humanoid aliens. In the foreground, depict the shattered remnants of a once-great city, with crumbling skyscrapers and overgrown vegetation reclaiming the ruins. The sky above should be a mix of ominous clouds and an eerie, otherworldly glow, hinting at the presence of alien technology. In the center, show a group of imposing, humanoid aliens standing atop the ruins, their features both human-like and unnervingly alien—glowing eyes, elongated limbs, and subtle, otherworldly armor. One alien should hold a flag planted firmly in the ground, symbolizing their dominance over Earth. The color palette should be dark and gritty, with shades of gray, green, and metallic silver, contrasting with the glowing accents of the aliens. The title of the book should be bold, with a font that feels both futuristic and worn, reflecting the dystopian setting.