Rip out those big green balls. They are doing nothing for the space.
You have a beautiful brick foundation with an interesting pattern. You do not have to hide the brick or fill up that space with more gian green balls. Choose evergreens that will stay either low to the ground (like a japanese spreading plum yew) or that you can keep in a small tree form (like a wax myrtle or an emerald green arborvitae.) You may consider some sort of non-aggressive vine for the wall. Ivy, jasmine, and japanese or chinese wisteria are very aggressive in the south; I'm not sure about your zone.
As for the rest of the space, I would use dwarf shrubs and perennials. In general, in order to have the best impact, you should plant in groups of no less than 3. Because of all the straight lines and rectangles, I would not plant anything in rows--groupings with curves.
That's all I got right now--got to get back to yelling at my students.