Colors :
My main goal is to consider contrast and harmoney principels in building shaping to get more attractive.
I have to tried to use the colors that you suggested, However I used two new colors ; (Good Luck) Behr P400-4 for some decorative elements and (Grasslands) Behr P410-7 for pillars.
decorative details :
My main goal to this part is use the gingerbread/decorative details that match to history of building.
suggestion to make the left elevation :
I think this side of building has good potential to consider as a green wall.