|Looks already like a bunker!|
I had 2 of the above pieces so I set to carving them into hill shapes. I wanted some paths on them but they are hollow so I could only carve so much away.
Now I added filler all over and sanded them as smooth as I could.
|The light dry brush makes the dirt pop|
Now I moved into making the rocks look more rock like. Using a few dry brushes of light grey with a final small one of white on the edges.