Once the walls were dry I painted them a slightly darker shade of tan than the roof, with dark brown going on those areas of exposed brickwork. To bring out the texture of the spackle so it resembles stucco I gave the whole wall areas two increasingly lighter drybrushed colors, a mix of the basic tan and vanilla white, followed by pure vanilla white. Once everything had dried I gave the whole building a wash of sepia ink diluted with rubbing alcohol, a trick I picked up from railroad modelling. The alcohol spreads the ink evenly and evaporates quickly, leaving a nice weathered effect without mess. The photo shows the final result, although the tembe looks somewhat darker in real life due to the lighting conditions when the photo was taken.
I think it looks the part, ready to take its place on the table for use by anybody who has need of a fortified building in my fictional African world. And you can be sure there'll be many!