I like the setting and the mood. Personally, I would have composed the way you have done if the polar bear on the right were not there. In the present case, more space at the left and less at the right would strengthen the composition. I wish to see these magnificent creatures in the wild someday. Till then, have to manage with your nice images.
Not knowing what is on the left, I go with Sabyasachi too, more so as well in that I feel there lies more interesting habitat there too Ken. Very nice either way.
Oops in changing this to pano, I forgot to crop the RHS.
The left hand has nothing further.
I think it is worth saying that standing on the bow of an icebreaker, cracking ice, pitching up and down and side to side, along with around 10 others is not always conducive to framing an image, especially when you are hand-holding a 500mm.