Hey Guys! I recently started with Blender a few Weeks ago and just try to achieve a decent looking Terrain Render.
So far im pretty satisfied with most of it, but there are some things left to do - and probably more, based on your possible advice 
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Subsurface Scattering for the Snow , theres currently none as it would have killed my Render Time. Currently 25 Minutes on a Ryzen 1700 CPU-Only Render with 220 PT Samples. Couldnt use CUDA as i only have 3 GB VRAM and the Scene uses up to 15,5 GB in Render. I already denoised the Image in PS as even with 220 Samples the Snow gets super noisy in the shadows.
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The Cliff on the Left doesnt look good to me. Id love to do some Sculpting there but currently i cant, as i use an 8k-heightmap for a displacement modifier ( that would be about 64.000.000 Vertexes for the Mesh if i want to use the maximum ammount of Detail the Map offers - what i actually do for the Render
) , followed by a subsurf modifier for the Render. If id apply the Modifier so i could do some sculpting, i wouldnt get back the possible Detail for the Render, as i need to stay in a reasonable poly count range for sculpting. If anyone knows a decent workaround for this issue, let me know it -
Probably changing Sun Direction so the foreground isnt that dark anymore.
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Adding a focus subject at the end of the footsteps path, currently thinking of a Tent which is lighted up from the Inside - to give some warm color contrast.
The Heightmap was done in World Machine & Photoshop to smooth out the Foreground and add the Footsteps (yes, done them right in the heightmap as i need to conserve memory right now, was quite a pain…) - the Material itsself and the minor displacements for the snow & rocks are fully procedural, so i can still fix possible issues here if u have some advice left for me!