Just a quick post to show you some of the landscapes that I have been creating in Blender recently. I have been going through the Nature Academy series of courses (which you have to pay for, it is closed now but I believe it will re-open soon), created by Andrew Price (at blenderguru.com).
Andrew Price has created some fantastic tutorials, and I would heartily recommend that you check out his web site. His latest offering, the Nature Academy series, is all about creating natural landscapes – rocks, trees, grass, lakes, mountains, and so on. Each tutorial (and I am only half way through so far) is chock full of interesting techniques. I have found it invaluable going through the process several times in order to create landscapes in Blender – even though each landscape is different.