Well, I say black, but I mean a dark grey color, something to just show the shadows especially since those sandbags seem to be one piece and there is no real gap between them to show it naturally.
like this
Thats from a work of mine
I'm sure the ground would or could look like that, but just looking at a large diorama and the majority of it being just one color turns me off. There is no variation. Even if it was just mud the mud would not look the same color. not just naturally but from any other thing, oil in the dirt from vehicles, plants, mud tracked from other eras, minerals and deposits in the soil, materials from vehicles and supplies coming in and out of the area.
I still dont understand how mud and dirt enough to make the roof red would get ON the roof.
And as far as
"Your points are constructive yet border on a critics view point, its
all in how its worded buddy as sometimes criticism turns new members off
posting their work."
This is a forum where people come to show their work, get criticism and critique, and improve. If you dont want that you dont post. I have started posting ALOT less because people dont reply. If you cant take criticism you wont ever improve.
Now you tell me what would help our friend here more "Hey, that looks great" or my post?