So, as I promised, here are some screenshots from progress of designing my map.
I would like to add also some screens of my very first sketches, but I lost them .
So, here is oldest one I could found. Everything is created with simply brushes, only one texture is used. My only goal in this phase was a gameplay...
Later, part of the map was detailed, and other side was still heavily edited:
And now, almost everything is detailed, items are placed,.. and it looks like this: