Hi there, I think it's a great idea to introduce some feature lighting here. The chairs are making quite a statement against all the white and it would be lovely to balance that a little with lighting. As you have a lot of white and also rectilinear shapes, I'd lean towards organic shapes and materials for your lights. You could consider having more than one pendant light and create either a cluster, a row of 3, or else a long light. Here's some ideas.

We have a similar set up to you. I don't recommend seed as we got so many weeds come through. We cleared that and turfed it and love it. Lots of hard work and upkeep but worth it. We have done hedging along fence line and the half acre of grass and the rest we have kept the natural bush. Eventually we will be making it more of a useable bush area with grass surrounding the gums.

Very pretty plant but keep in mind that it will most likely have a short flowering life. A fiddle Fig is very popular with great leaf shape and easy to manage, just plain green all year round. Mother Inlaws Tongue, Snake Plant is another popular easy to manage plant,

I would use viburnum as they are a great hardy plant, there is the sweet viburnum , or emerald lustre or dense fence, lovely lush foliage and white flowers, need a good free draining soil and to be watered regularly, you can grow them to whatever height you like, they respond beautifully to clipping and enjoy all weathers , a slow release fertiliser during spring keeps them looking beautiful.