Great capture, I never get tired of seeing snowy owls! Obviously, the right eye is in a bit of a shadow. I know the D3 has some great latitude for pulling details out of shadows. Is it fixable?
Sharpness and exposure look great. Minor fixes I would do are the following: CCW rotation, adding canvas back at the top (if you have it), and toning down the bright streak near the talons. It has been a brutally cold week here in Ottawa too (same temps as you indicate)...kudos for going out anyhow!!
Lovely pose- really conveys the feel of soft silent flight. Agree re rotation. I would remove of blur the single sharp stalk. Brightness, sharpness and colour all draw the eye and I find the sharp stalk pulls the eye away from the bird.