Macadamia definitely has greenish undertones. I used it in my kitchen because of them - it brings out the "fresh wood" look rather than the "yellow maple" look in my natural maple cabinets. I'm not sure how much it shows up but here is a picture.

Yes, you have to try a pretty large swatch on your own walls to make sure a color will work. I had spent a lot of time picking the colors for my house in the northeast. When I moved to CA I thought I could just use the same colors. Wrong! The colors I had loved in the old house did not work in the new house. I had to repaint the whole downstairs after that mistake!

Shutters are too small for the windows and I think they don’t add much. My suggestion is the paint the house all bright white…B.M.Super White. Leave the brick as is and paint the door B.M. Somerville Red. I woud most definitely power wash the roof (carefully).

PPG's Delicate White. I use Swatch Right paint-peel-and-stick decals for trim and moldings because they're a thin film and will conform to the details.