Should add some evergreen plants such as hostas,junipers...for winter interest and garden frame.but it is important to tie the areas together so it is a cohesive look.
You really need to post some pics that show the context and situated and conditions and the property line and the perimeter
of the yard and You need one that shows the overall yard from the street(They are not too close up).
first upload photo to any photo-hosting site.Photobucket and Flickr are examples . While at that photo on the site,
look for a link to "share." Then look for a way of obtaining "html code" (don't select the thumbnail version.)
Copy that code and paste it directly into your message here.
We should know soil PH.soil and climate or your place too.