Mountain Landscaping

So for an upcoming special server I am joining I am deciding to make my base a mountain base and that means new mountain terraforming will be necessary. So I went onto the seed and made this in about 2 hours or so in creative and this is my very first major terraforming project I have undertaken. So any tips on what I can do to make it better is greatly appreciated.

I only did 1 side of the mountain since I am going to just have to restart once the server is up and online. I made the weather turn on for a few minutes to get more natural snow forms ontop of the mountain (which is what I would do on the server), let nature do some of the work haha.