What a beautiful home! I do, however, think the house needs to be brightened up! I like the idea of adding stonework to the pillars on the deck, it would relate nicely with the garage. As for the trim colour, I'd suggest pulling a mid tone from the stone work and using that as your trim colour and perhaps for your garage door as well. I would definitely recommend using a pop of colour for the front door, or if you prefer neutrals, pick a colour a few shades away from whatever you end up pulling out of the stonework for the trim.

The closest BM match to Mellow Grain would be Dunmore Cream if that helps you to visualize it. Here is the reason that I wouls prefer to not live in the "Red House"-it may not apply to your environs. Our area is mostly new construction in subdivisions-most of the homes are no more than 10 years old, and our particular neighborhood didn't break ground until 2005. For resale it seems to be best to paint the home a color that blends well and fits in with the surrounding homes-the few homeowners who tried something different and then tried to sell ended up selling for less than they should have-in one case a home that the owner had painted a pretty potent blue color was listed for 6 months without an offer, then painted and relisted at a price $15k higher than the original price only to sell in less than a week. I don't really do anything to the outside of my home without some consideration as to what it might do to my resale potential even though I have no plans to move. The last two homes we bought and sold had less curb appeal when we bought them than when we sold them-we were able to buy them cheaper and sell for more. The first house I ever bought was Pink-PINK. The agent didn't want me to see it but I forced her to show it to me-we stole it and the first thing we did was paint it a creamy yellow. The neighbors all thanked us.

Yes, the roof is blue to us. For the siding, I'd choose a color close to a mid-tone in your brick (i.e. not the darkest, not the lightest, not the boldest, not the dullest). It will blend well. Given everything going on in the facade, you want a quiet blending color on the siding IMO. It's a beautiful, interesting-looking house.

Where are you located? Is your roof a redish/orange tone? You need to work with that and then improve your landscaping too. I think a Sage green color would be very nice. Maybe a light cream if you want a more yellow look. But not a strong yellow. Yellows get strong very fast. So go two shades less strength on yellows.