I LOVE your house and II would not touch that mortar - it goes nicely with the aged stone look. I would stay in the brown family for roof color to compliment the aged stone look - not a color that is bright or harsh or crisp. The door is too "fancy" for the house and all the trim is too "crisp" white...look in the cream/taupe/earth-tone family. Not navy or black. Shrubs need to go - think subtle English countryside landscaping. I also agree on clapboard, not stucco, for your addition. I can see ivy climbing the walls - but won't suggest that as you can never get rid of it and it is not good for your stone. Looking forward to your transformation.

FYI Romabio is good at what they do ... no argument here.... but they have a limited range of only whites & very light grays and it cannot be applied to anything with conventional house paint on it, only raw unpainted masonry or other mineral paint applications. There are several other mineral paint (aka potassium silicate) paint co's in the US, a couple of which have a sort of "primer" product which can go over conventional paint - try this is one : https://www.beeckmineralpaints.com/ For best results though I think Id still want to get off as much of the paint film as possible .... but without going too far and damaging the brick. Then the primer product, and then the mineral paint. Of course this would be hugely labor intensive or expensive to hire out, that is assuming you can even find anyone who has heard of mineral paint or would want to do it. At the very least find a person who understands the science about this and doesnt shrug off the concerns - maybe there are some other types of breathable coatings that I dont know about. Michelle above is correct - any coatings need to be breathable, or there WILL be damage, its only a matter of time. The brick bldg across the street from me was painted only 12 yrs ago and is already spalling (ie brick cracking and disintegrating) terribly in some places near bldg exhaust vent and other places Its really sad how the big box, do it cheap mentality of the last 30-40 yrs has resulted in so much shoddy workmanship that is now considered the norm.... and actual physical damage. Not many people thinking long term any more, beyond 10 or 20 yrs.

It is difficult sometimes for us to assess colors via the internet. What we see may not relate well to what you are seeing. How do you like Pavestone? It is not as gray, but still pretty neutral. This should have reduced the purple. Operative word 'Should'. Lighting is different on every home and geography.

Are the siding and roof in good condition? The siding looks very nice as is so unless it's in bad condition I would not personally change it as it's a very nice color. When the roof needs replacement black metal sounds nice. I'd suggest the black metal roof that you will eventually have on the house for the pole barn. You could go with a similar color siding on the barn, or go more barn-like with a red or green vertical metal siding. For me the biggest issue isn't the house roof or siding, it's landscaping --- which I know you are working on! I'd hire a really good landscaper and put my money there first as it will do the most for enhancing the exterior of your home. If you have a picture from further away it might help others provide some specific landscaping ideas as well.