Another indicator is that tail. It does seem long, yes. But look how skinny or narrow it is. Polar bears have smaller tails in general because it's less surface area. This means they lose less heat that way - similar to why they have such small, round ears very close to the head.

And if you look VERY closely, you can just barely see the ridge of the ear in front of that right shoulder. The ears are small! The tail is relatively small (considering the size of the bear). The legs are thick. The feet are massive. And the bear is white, with no shoulder hump.