You can certainly fix a lot when shooting RAW and have a good developing program like Lightroom. I have saved a few. But with that said I find things work much better if you just get it right in the field to begin with. I have really pushed myself to get as much right while shooting than hoping I can save it when I get home. I don't see much snow where I live so I can't comment on taking pictures of it. The total quality of the final image will be better if you nail it to begin with.