I did these figures with the construction of the diorama in mind. All four figures were disassembled and spray primed.  They were then brush painted entirely flat black. I painted the boots, belts, holsters, vests, etc. with gloss black to bring out the detail. Next I painted the camo pattern with smoke grey and white. Finally the guns were dry-brushed and as well as painting the side arms, knives, grenades, ammo, etc.