Wow, thanks everyone, particularly for the advice.
Let me lay out what I’ve done:
-Cut the top tile up (to show elevation) then wood-glued it to the bottom tile.
-Hand painted with two coats of latex paint to protect the tiles.
-Spray painted with matte brown.
-Spray painted with a brown ‘textured’ paint (it has little rocks or something in it to give texture.
-Spray painted the rivers/paddies with a satin green.
-Hand painted with acrylic brown all the dirt, then dry-brushed it with a yellow acrylic and then a white acrylic.
-Hand painted the grass with acrylic brown, dropped the flock on, pressed it, then shook the excess off.
So, sounds kinda close to Irish’s method. But I’m still getting scrapes in the flock…