Our free Planting Guide for this landscape plan includes a larger version of the illustration, a detailed layout diagram, a set of five regional plant lists, lists of alternatives for each plant, and complete instructions for installing the garden. (Free, one-time registration allows unlimited access to Planting Guides for all garden and landscape plans.)
There is a trellised sitting area, but the open area in the yard could have willow chairs or another seating arrangement with tables. Lighting can be added along the walk, or line the edge of the garden border. Lights at the base of the trees would add a measure of drama.