Thank you for suggestions yet again. Here is a litle progress.

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Name:	Region C_v2.0.jpeg 
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1. Cracked icy lands are done.
2. Shaded all islands
3. Added a cliff-like elevation on the right middle side of mainland (just a tiny fraction). I am not sure if this looks ok. It has kind of perspective look.
4. Couple more hills here and there on the mainland.

I hit a wall with the forests, this will the the biggest challange for me in this map. I also don't know if i can handle making south part of mainland less snowy by adding different colours, especially if i would like to try some tundra. Colour will break the subtle shade on white - which means i have to redoo shades on that part - a work i would rather try to avoid. This maps gives me a hard time.