This looks very promising!
Great composition and nice overcast

You've pointed some things for improvements and I think you could best use distance shaders to split up the detailling of the rocks in fore- and background.
This way you can easily use differently scales powerfractals without having impact on the foreground. Keeps your nice POV intact as well

Martin
btw still have to render that snow on your dirt ground render...please help me remind it if I haven't done it in the next few days