Nice start! You're right that the latest change looks odd. Do you have a picture of a bear you're working off, or are you doing this from your memory? I guess the body at least is from
this picture.
I've tried to do a quick edit, even though I don't think I've drawn a bear since I was a child. Now, I'm not saying that my version is good (in fact, my bear ended up looking more like a raccoon than anything), I'm just trying to illustrate that your bear's snout needs to be more elongated and it's almost as if you're missing the whole bottom jaw of your bear. I'm not a very good artist, but this edit hopefully explains more than I could do with words.
Finally, I would like to say that it's very rare to see a polar bear surrounded by trees, as they tend to stick.... near the north pole, where there's a distinct shortage of trees. [Fun fact: this is actually how the polar bears got their name. The north pole.
] Sorry, I didn't mean to be snarky. It just seems easier to keep this as a "black bear" than to change it into a polar bear.
I don't think you need to add more snow to the trees. Wind and sunlight will reduce the snow on trees from time to time, even in an otherwise snow-covered landscape. I do agree that the three trees look like they're on a single line, which makes it all seem less natural.