Create a high-resolution, photorealistic image of a family of polar bears in the Arctic tundra. The scene should capture a mother polar bear with her two cubs walking across a frozen landscape. The mother bear is leading the way, her powerful yet graceful form covered in thick white fur that blends seamlessly with the snowy surroundings. The cubs, playful and curious, follow closely behind, occasionally stopping to nuzzle each other or explore the icy terrain. The vast expanse of the tundra features jagged icebergs and snowdrifts, with the pale blue sky overhead reflecting the cold, pristine environment. In the distance, the soft glow of the setting sun tinges the horizon with shades of pink and orange, casting a warm light on the bears' fur. The overall image should evoke a sense of majesty, endurance, and the delicate beauty of the Arctic wilderness.