Here's where I got with the hills when I stopped for the day, last night:
I also painted the inside of the cave entrance with this mixture:
You can't properly see it, because of the Warcaster standing in the way.... Sorry about that. ;-)
You can see though, that the PVA and sand didn't cover everything.
That has been remedied by the next step in the process, which I completed today:
I added ground cork and fine grit basing gravel to the cracks, crannies and other areas where smaller stones might accumulate. Additionally, I used some finer powder in patches to give some extra variation in texture on some of the hills. I hope this works out.
The hills are currently drying outside from a "varnish" layer of glue I sprayed on to fix the smaller rocks and pebbles in place before I can primer them.
Now to figure out how to go about painting them....
See you next time!