water dinosaur, Mosasaurus, underwater scene, aquatic plants, coral reef, bubbles, dynamic pose, swimming, prehistoric creature, scales texture, blue-green water, dappled sunlight, deep sea, marine life, fish schools, 3/4 view, realistic, detailed fins, glistening skin, ambient underwater light, wide-angle lens, high-resolution, survival game theme, action-packed, vibrant marine colors, submerged rocks, ocean floor, tranquil yet dangerous atmosphere.