I didn't say 'muddy', someone else did but since you are interested.
Snow and open sky photos are probably the most difficult to expose well. The dynamic range is so great that a single exposure can't get everything exposed correctly.
Look at the last photo.
Most of the snow doesn't look white and the sky looks a medium grey but even so, lots of patches of snow are blown out.
There isn't that feeling of clarity and brightness one gets on a snowy day. (and if the day is dull, why are we taking the picture?
Notice the amount of grain in the open sky in the screen shot from a Noiseware app.
Shot 6 is a complete mystery, you've framed out the lower part and the upper part of the buildings and yet not given the viewer a real center of interest.
Decide what you are interested in and frame the shot around that.
It's encouraging that you are aware that there are things to see.
Now just learn to define what is interesting you and frame around that so the picture doesn't seem arbitrarily chopped and the viewer is comforted that he understands the picture.