Broad-leaved evergreens are more easily pruned and more cheerful. Buxus sempervirens is tough (as long as drainage is good) and makes an attractive specimen in full shade, with better foliage color than may be seen in full sun. Upright forms are available, otherwise one could be pruned over time to a fan-like shape that or another that fits the space.

Could you put some "garden art" on the wall to add height while plants grow? Perhaps something with a mirror, colourful stained glass or like a window?

lots of mahonias would work there. easy to keep in check.

We're trying Ilex Sky Pencil and are thrilled with the look. The nursery assured us the plants would do well, but grow slowly--perfect. We're hoping plan four will be the one! This site has given me lots of advice for my difficult front yard, and I'm very grateful. It's looking good!