I'm not certain about using the flash. I would think you would have gotten glare. I don't get too many opportunities to shoot snow, we get it once (no more than twice) a year and it usually lasts the one day. I meter off the snow and then increase my exposure by thirds. I end up with multiple shots with different exposure values, but I like to see the difference in camera that changing the exposure makes when shooting the snow.
What photo imaging software do you use? There are some things that can be tried in post to get better exposure and keep the contour.
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Lori Putman flickr
~No one can drive us crazy unless we give them the keys
~~Life isn't about waiting for the storm to pass, it's about learning to dance in the rain!
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