Create a realistic 3D scene of Santa Claus riding a tall, muscular reindeer resembling a powerful horse. Santa is dressed in his traditional red suit, gripping the reins firmly, while the reindeer rears up energetically on its hind legs. Ensure accurate anatomy for both Santa and the reindeer, with realistic fur textures, detailed expressions, and dynamic motion captured mid-action, emphasizing strength and holiday spirit in the pose.