I've done a closer look at the brick wall, as its a common problem in drawing architecture - a big unbroken area of brickwork that is an important part of your sketch. I've done a sketch of this section in pencil to show you how I'd probably tackle it, and I've done a step-by-step in pen and ink as well. I found it quite interesting that an aparrently dull subject can turn into quite a nice little sketch.

