Create an image of a majestic polar bear walking on an iceberg in the Arctic. The bear should have a thick, white fur coat and be depicted in a natural, realistic manner. The background should feature a vast expanse of icy waters and snow-covered ice floes, with a clear sky overhead. The lighting should be natural, capturing the cold, serene atmosphere of the Arctic environment. The image should convey the beauty and harshness of the polar bear's habitat, highlighting the animal's strength and resilience in such a challenging environment.