I know others have stated that the exposure looks good, but I disagree completely. The snow doesn't look white, it looks dirty and bland. When I look out the window at snow, it looks white, even when the sky is overcast. The snow in this picture does not have that quality at all. Your brain might try to correct it because it knows it's supposed to be looking at snow, but look at the massive difference between the whiteness of the snow and the whiteness of this site's background.
Thing is, it's REALLY hard to get snow right in photography because the camera's meter mistakes all the white for "light". For proper snow exposure, I'd have a close look at the histogram of each shot you take. Don't just look at the snow and assume it looks "white enough", your brain will fool you. Check to make sure the histogram is actually sitting near the right edge. The closer it is to the edge, the whiter your snow will look. The more snow in your shot, the bigger the "right" hump should be. Also, if your histogram is near the right edge, and the hump there is really wide, that means your snow will probably have lots of detail (instead of just looking like washed-out white).
The adjusted version that tcdk posted improves on the snow's whiteness, but it kills all the snow's detail. The snowman looks flat, almost like a cardboard cutout. It's possible to improve the appearance of snow in PP, but it's best to get the exposure right at the time of shooting.
Last edited by GoremanX; 02-07-2010 at 06:42 PM.