Hey, I'm submitting a concentration portfolio for landscapes this year so I may be of service.
The most important thing to remember to do when you see a beautiful view, is to add perspective
by adding perspective, you give your photo depth and it lets your viewer see the dramatic picture as you saw it.
With your current photos, I cant tell whether or not you were 10, 100, or 5,000 feet away.
The next thing to note, is lighting conditions, tonal range, and negative space.
The key to good landscape photography is to create tonal range through dramatic lighting.
You have a good start with the fog, the black, and the snow. Adding perspective should generate the desired negative space.
Finally, burning and dodging.
We've left the darkroom, but no photographer can do without burning and dodgeing.
Clouds aren't showing up as you wanted? Burn them in.
Image not balanced? Dodge the highlights to make them brighter, burn the dark areas to concrete blacks.
If you'd like to know how to set up a burn and dodge layer, just PM me.
Otherwise:
Shoot in Raw
Use an SLR (doesn't have to be expensive, I do professional work with a D40) ( I just cant blow it up or print at res 350)
Know photoshop like you know your penis.
Learn to love brightness and contrast layers.
Experiment with mixing images or creating your own sky.
Thats it!
Sorry to ramble. Hope it helps.
-Wolf