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You did pretty good here for a beginner, you have some very nice compositions. The biggest issue that you have here is blowing out highlights, you can see that in #2 to 4. White snow, water, etc being blown out with a loss of detail. That can come from not exposing properly, or shooting at a time of day when the whites are being lit by the sun so that they are so much brighter then the surrounding areas. Shooting at earlier or later times in the day, or on overcast days will help with that. Now it also could come from your processing, it's easy to adjust the contrast and if you don't watch the highlights they will blow out. So you should look at your original raw shots to see where it was that the highlights got blown out.
With all that said... #2 is my favorite shot. A very nice composition that is only hurt by the blown out water detail. #4 is my next favorite, nice work with the layers there. #1 is interesting, I like what you were going for. But as a suggestion, go to a pano crop on that and totally crop off the top so that now sky is showing, you will see a totally different mood in the shot. #3 almost works, it's an interesting shot, and not an easy one to take in terms of composition. It comes across as being too busy for me, but it looks like a cool place to have been.
I hope that helps, keep on shooting, that's where you will grow the most. You have a pretty good eye developed for compositions, so keep at it.