Here is a file I saved and a link to some nice inspirational photos.

100 EASY PLANTS FOR THE COASTAL NORTHWEST
http://www.colvoscreeknursery.com/notes.htm

These plants are adapted to our highest and lowest temperatures and summer drought. Most are flexible about soil and sunlight, though quite a few want sun and good drainage. None needs annual pruning or grooming and none are typically susceptible to serious pests or diseases. None are very invasive or weedy.

Acer circinatum/ vine maple
Acer ginnala/ Amur maple
Artemisia ÂPowis CastleÂ
Aucuba japonica
Callicarpa/ beautyberry
Callistemon/ bottlebrush
Calocedrus decurrens/ incense cedar
Carex comans/ hair sedge
Carex testacea/ orange sedge
Ceanothus ÂConchaÂ
Ceanothus ÂVictoriaÂ
Cercis/ redbud
Chamaecyparis nootkatensis/ Alaska yellow cedar
Cordyline australis/ dracaena palm
Cornus kousa/ Korean dogwood
Cotinus coggygria/ smoke bush
Cotoneaster buxifolius
Cotoneaster lacteus/ Parney cotoneaster
Cupressus sempervirens/ Italian cypress
Erica/ heath
Eucalyptus archeri/ alpine cider gum
Eucalyptus parvula/ small-leaved gum
Eucalyptus pauciflora ssp niphophila/ snow gum
Exochorda/ pearl bush
Grevillea victoriae/ royal grevillea
xHalimiocistus sahucii
Helictotrichon sempervirens/ blue oat grass
Iris douglasiana and hybrids/ Pacific Coast iris
Juniperus chinensis and cultivars/ Chinese juniper
Koelreuteria paniculata/ goldenrain tree
Libertia ixioides
Maytenus boaria/ Chilean mayten
Myrica californica/ Pacific wax myrtle
Olearia x haastii/ daisy bush
Osteospermum barberiae/ African daisy
Parrotia persica/ Persian ironwood
Phormiun tenax/ New Zealand flax
Picea omorika/ Serbian spruce
Picea orientalis/ Caucasian spruce
Pinus-most/ pine
Pistacia chinensis/ Chinese pistache
Pittosporum tobira/ tobira
Polystichum munitum/ sword fern
Prunus lusitanica/ Portugal laurel
Pyrus callerayana and cultivars/ flowering pear
Rhamnus alaternus/ Italian buckthorn
Rhaphiolepis
Rhododendron ÂP. J. M.Â
Rubus pentalobus/ Taiwan bramble
Saxifraga umbrosa/ London pride
Schizostylis coccinea/ Kaffir lily
Sempervivum/ hen and chickens
Sequoia sempervirens/ coast redwood
Solanum crispum ÂGlasnevin/ blue potato vine
Taxus baccata/ English yew
Tsuga mertensiana/ mountain hemlock
Ulmus parvifolia/ Chinese elm
Viburnum carlesii/ Korean spice viburnum
Viburnum opulus ÂAureumÂ
Viburnum plicatum/ doublefile viburnum
Viburnum x pragense
Viburnum tinus/ laurustinus
Yucca
Zelkova serrata/ keak

Mike Lee is a landscape architect and founder of Colvos Creek Nursery on Maury Island.P

Here is a link that might be useful: Stunning island garden photos

I was trying to find photos of Daniel Hinkley's garden I remembered seeing, former owner of Heronswood gardens, but couldn't seem to find them, but found these.

Here is a link that might be useful: garden

Thank you so much that is just what I was looking for> You are a jewel! Now I can start studying!

Looking at mature plantings in your area can also help since it's easy to buy some cute plant only to find it really outgrows your space in a few years. It looks like you have a lot of bare spots that will look lovely with plants draped over them in a few years. Good luck with the terracing.