"Concept art of an extraterrestrial creature inspired by the xenomorph from the Alien movie franchise. The design should emphasize the creature’s biomechanical aesthetics with a sleek, exoskeleton-like body and elongated, ribbed limbs. Highlight the signature features such as a smooth, glossy black exoskeleton, intricate, alien-like head structure with a retractable inner jaw, and long, spiked tail. The creature should exude a sense of otherworldly menace and elegance, combining elements of both organic and mechanical forms in a dark, atmospheric setting.