What a massive pose! I can imagine a pour vole caught in this guy's shadow as it pounces down on it. I also like the snow flailing underneath the wing. Might consider cloning out the few bright imperfections in the snow near the bottom.
Great photo of an awesome animal Bill, very impressive. The resized jpeg could use some selective sharpening on the head. Personally I would try to get rid of the blue cast in the shadows and the BG.
Thanks Vincent for your helpful comments. The blue in the shadow and n the snow is a natural reflection of the blue sky. I'm not sure that changing it would look right.