Since I was not using any brick textured material, I placed some thin card "brick" randomly about the surface to be highlighed when painted. The rest of the brick areas got two coats of stone texture paint. I believe this came from the Michael's chain of craft stores in North America. There is a variety of particles in the paint which give a pleasingly even textured surface. Colour choice is limited, and the light colour I am using is not very opaque. You could put a base colour down if you are not intending to paint the surface after the texturing. There are a couple of other shades of this available.
There used to be an alternate brand of this type of paint that had some very nice brick and stone colours. This other type had a variety of particulate and was very nice as a final coat. It sadly is no longer available. (Too bad as I would like to add some bits to my fortress and would like to match the colour!)
The next photo shows the window frames painted and the shutters assembled. The shutters and the upper vent on the door-wall were made by gluing strips of thin balsa in a wide staircase formation. This was then cut into strips and framed up with more balsa strips. Tedious, but fairly effective. (You can choose to work neater and more precisely than I did!)
Regards, Rob