I think you are missing fragile, large curtains. You should add some exotic plants, can a small fountain? Marble will look great out there.

Chris, not quite sure what you would like help on. Can you repost your question with more details?

You should use plants there and the best colour of stones will be brown or grey because these colours will look similar to your exterior part of house, So according to me just not only the stone work is needed you should use some curtains and some plants over there