Ancient marine reptile gliding through deep blue ocean

A large, dark-scaled marine reptile, likely a Mosasaur, swims gracefully underwater in a vast expanse of deep blue ocean. The creature is positioned in the left-center of the frame, its elongated body angled towards the right, with its head slightly lowered. Sunlight streams down from the upper left, creating shimmering shafts of light and a rippling surface effect at the top of the image. The dinosaur's skin is textured and appears wet, reflecting the ambient light. Its four paddle-like limbs are extended, aiding its propulsion through the water. The composition uses a wide-angle perspective, emphasizing the immense scale of the ocean and the solitary presence of the dinosaur. The lighting is dramatic and atmospheric, with bright highlights on the water's surface and gentle illumination on the creature, creating a realistic and slightly ominous mood. The overall scene conveys a sense of prehistoric majesty and the raw power of ancient marine life.