That roof looks pretty good, again, you could hit that with the same wash you used on the sides to tone it down a bit, maybe add a brown tinted wash as well.
Ken,
Your doing real good for a first shot. I have done many, many buildings and would like to offer some suggestions. First, I always take the walls of my buildings outside and spray them with a brick colored primer…Krylon or some cheap brand from Wal-Mart. Then, for mortar, I use a wash of joint compound (the stuff you use to smooth the joints in sheet-rock) mixed with a little water. Once it dries, you can take a small sponge and wipe off the excess from the surface of the bricks till you like the result. Then, to tone down the “white” of the joint compound, I use a wash of india ink, as others have suggested. I know a lot of guys swear buy the use of white paint for the mortar lines, but I tried it and like the joint compound better.
Hope this helps.
Mondo