Ok are we talking architectural designer or interior designer? Architects are more about lines and form and they grumble about the interior designers but that's who they hire to do the color boards. Either way you are the client and it's your house. It may be a great color scheme for the design but if you don't like it change it. Those sample of paint are worth every penny because you need to see more than a little chip. With your asymmetrical design you have room to vary more than the usual field or base color and a contrasting trim. I'd make a tracing of the design and copy a bunch of pages of it to use as a coloring book. (yes use crayolas:-) Another shade from the same shale grey paint chip and a one more accent color would be a good bet. If you are going subtle neutral, make it 3( not 50) shades of grey and play with where you put the darks and lights. Remember sunlight and shadows will create alot of contrast for even a "pale monochrome houses. (the computer rendering doesn't give you that.) You could add a pop a smoky teal, plum or coral if you want color as bold as you design. These would just be accents or trim. If shale grey it a really light silver you could make a monochromatic scheme with blue grays and a navy blue door and trim. The tan/beige in the rendering needs a darker grey to work. I would keep my midtone color on the lower level and a lighter shade on the second level. The top part that pop out could be a bolder accent color withe rest of the upper level almost white. Lot depends on your roof and window frames and whether you want them to blend in or pop out. Try a bunch out on paper or one of the computer programs before choosing any changes.

The next time I decorate by a colour of the year will be the first time. Don't hold your breath. I have nothing against this particular colour but it doesn't work with all the things I've collected over the years, and I am not about to discard carpets bought after hard bargaining with dubious merchants in Istanbul or Islamabad because they don't "go" with a paint colour that someone voted "colour of the year." In its place, I think the colour would be quite nice (better than this years choices, certainly). It's just that my place isn't the right place for it.

Before replacing your curtains as this can be quite expensive for such a large window, if they are in good condition, add a band of extra fabric to the bottom in what ever suits you, your existing curtain track can then be moved up to the ceiling for good looking full length curtains without the large round eyelets, could save you a lot of money, I would look at replacing/removing the sheers cheers

the plants on the back fence will give good impact once grown. The rug is more of a pain. This would be a cleaners nightmare. Gives the area impact but not a suitable design choice near a pool. The mirror looks good but near a bbq you are always going to have to wipe the grease from off the mirror. The plant will also have to be removed once you start cooking. The chair is to close to the bbq and the fridge. So this would have to be moved to be able to work in this area or open the bar fridge fully. I do not mine any of the furniture but not a suitable out come for the area where the design seems not to be workable. Vision is important but design area must also be hassle free.