The walls are up and painted with a quick coat of house paint.
For this step, I use regular house paint from the hardware store. A great trick for getting cheap paint is to look at the mis-mixed paints at Lowes or Home Depot. You can get a gallon of paint that was mixed incorrectly at a reduced price. The color of the base coat doesn’t really matter to me–any light color would work. For large, scenic dioramas, you could use shades of brown or green.
Things are starting to take shape! It’s always a good idea to step back and make sure everything looks right. Items on your diorama might not always be 100% accurate in scale, but they should look like they are! Place a few figures and props on the diorama every now to make sure you’re still on track.
With the basic walls primed, the next step will be to add some color.