Hi definitely remove the x bars on the deck balustrade. Landscape close to the house so it grounds the house. Trees will make it look less bare. Chose some that work for your area, that are evergreen, and are not going to grow really big. With a really plain house - dark colors will make it look better. Dark Grey, or black with a warm tone so it doesn't have a blue undertone in it. Make sure it is a warm grey or black. Use green foliage around it. Paint out the pergola in the dark grey too or white if you want a different look. Fill in the balustrade where the x is removed with plants in front of those areas. Grow a vine up the pergola that is nice.

Same wood as the wall, with triple coat of varnish to prevent problems. Around the faucet, a solid piece of material, perhaps a solid porcelain tile drilled for the taps. Keep it very simple.

i would look at the McKenzie Childs catalog to get inspired. (http://www.mackenzie-childs.com/Furniture/)

Hmm, I'd aim for balance. The last time these colours were in fashion, in the very early 1990s, I had light pink, light blue , light green and black. In some rooms there was white instead of black. They all worked well together. There are lots of recent pastel rooms on Houzz photos. Also florals are about to appear on the scene, in big digital murals and digital printing on cushions, on rugs, etc. it's a modern version, but still florals. Pink and the pastels work well with florals. Which way does the room face? If it faces South, in the Southern Hemisphere, go for a warmer colour.