If there's one thing I've learned about drawing white fur, it's that it is much easier to draw the background first, then erase where the fur goes (especially in the sky). This is how I am approaching this drawing. There is a second reason, and that is I like to do the part of the drawing I'm the least confident in first. I know I can draw the bears. I've never drawn snow-capped mountains or ice floes before. So if I do them first, and something goes wrong, there's less time wasted in starting over (and there's nothing wrong with starting over, because that means you've learned something).
So here she stands, nothing more than a nose and eye in a silhouette in front of blocked-in mountains and icy water. Her baby will be in the foreground, not visible at this time. I am excited about this one!