That's a wonderful shot. I tried getting some shots of snow caps in the river a few years ago, but got nothing anywhere near that good.
How many of the upper level roads are open at that time of year?
Very few. All of the entrance roads are typically open, and you can drive to Badger Pass (may well need chains or 4WD for any driving at all), but Tuolomne and Glacier Point roads are closed, as are many of the trails going up the valley walls. On the other hand, it's absolutely gorgeous just walking around in the valley, and you can also do cross-country skiing and snowshoeing from Badger Pass.
Brian