Hi, Brian is right, there are exposure problems, but I see that you set the camera up to under-expose by 2/3 of a stop. That's your main problem.
Time for some basics. A camera meter tries to create an exposure which on average matches a mid tone - the 18% grey card. Ignore that technicality, basically it will make white grey, or black grey if left to its own devices. So to get white as white you need to over-expose, and not under-expose as you have done.
Ok, leave that to one side. Modern meters are very good, the manufacturers have built in a lot of examples and it will nearly always get them right. So in all these cases I would let the camera do the metering on one shot and then experiment. Once you have bought your memory card you can repeat photos in tricky situations and keep the ones that are best. If in doubt shoot in RAW and bracket around the camera's suggested exposure.
Next it is whether to shoot in RAW or not. If you shoot in RAW you can play with the exposure to get detail without the snow going grey. Have a look at this shot
from the Aiguille du Midi. I shot in RAW to make sure I could manage white balance and bring in the highlights without losing detail in the snow.
You can have detail and whiteness, the trick is to balance the whiteness of snow with the detail we see at the time of taking. It's a diffcult trick, but it can be done.
Hope this helps,