How can I add "roughness" to land in World Painter?

//ads -- adsterra.com -- native banner
?>
I'm using World Painter to create my own custom Minecraft maps with larger terrain features, like the below screenshot:
While it's coming along nicely, I don't like how smooth the terrain is. It makes the world seem a little, "unnatural". How can I make the terrain more "rough", like the below example, using World Painter?
Pictures about "How can I add "roughness" to land in World Painter?"



How do I add more brushes to world paint?
To install the custom brush, move it to the custom brushes folder, which you can open from inside WorldPainter by selecting Tools -> Open custom brushes folder in the menu. You will have to restart WorldPainter for it to show up.How do you add a structure to world paint?
The way you use these objects is as follows:Unreal 4 - Refelctivity control through Lerp and roughness maps
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Nothing Ahead, Nothing Ahead, Nothing Ahead, Matheus Bertelli