Hi Tony -
I think the paint job on your brick building is excellent!
The downtown area of the small city where I live is full of old brick buildings. While the fronts of the buildings are nicely maintained, the sides and rear of the buildings have multi-color brickwork that looks almost EXACTLY like red brick building in your post #52 above. The various shades of red on the same building are very realistic, based on the old brick buildings I see every day in my town.
Airbrushing might make them look TOO uniform, though as you say, it would be a lot faster.
- Jeff