The first step in making a camp is easy. I can measure 120mm x 80mm with the best of them. Then I stare at my canvas in miniature and I'm stumped. Unless it's the Romans. Nothing says camp for Romans like a Roman tent and a wall with pointy bits and some leftover legionaries. Unfortunately, such a display is only appropriate for Romans and you need to get more creative for all of the non-Roman armies of the ancient world.
I wanted to capture the "ruggedness" of Hispania so I toyed with the idea of an ambush in a mountain pass. It can be done but I couldn't get it quite right with the figures I have in this small footprint. I did take the "mountain ambush" idea and turn it into something I'm pleased with. Hispania was made up of the Iberians, Lusitanians and Celtiberians tribal people. I found some noncombatants in my lead pile and bingo, I had it. My camp would be the women and children seeing warrior husbands and fathers off. A muster for battle like this would've been a somber affair. If the invaders are not beaten and repelled, the tribe would face a range of poor outcomes ranging from slavery to outright annihilation. I think the old woman with her hands on her hips captures the spirit of it.