Do you have any pictures you could post of the space so we can get a better idea?

I would personally go for a lighter roof colour such as Shale Grey. Surfmist is quite white and could be glarie in the sun. Ironstone would attract further heat and could need further insulation to avoid excessive heat buildup. Even being surrounded by trees the roof may cop the heat. Shale Grey roof and facia's with the Ironstone gutters looks quite good together. Downpipes in Ironstone as well. Some people don't like to 'highlight' the downpipes but they are a feature of the house as well, in particular if they're round pipes with the half round gutters. I'd do the eaves in Shale as well. The Sierra Night and Arctic Cotton (or Ornamental Pearl) also look good.

Absolutely; and dual combinations are becoming popular also. (Rose gold + matte black for example.) It's exciting to see these trends emerge!

Don't plant the giant bird of paradise in this small bed. Fantastic plants and have used them at our house. They will grow so big and destroy your paving. I have also used clumping bamboo and my wife hates it due to the mess it makes. Constantly dropping leave etc. Would not plant near a pool for this reason. Another negative comment. Bougainvillea should never be planted in the ground. Lovely flowers but get our of control, dangerous spines and almost impossible to kill. Keep in a pot and keep trimmed. We put Xanadus next to our pool at our holiday house. Perfect size and clean. Consider other ways to hid the fence. Perhaps some type of bamboo screening??