You are right about the roofs, they do look slightly out of place to me too. I had to put them there to contrast the dull colors of the sandstone houses.
Good catch

You are wrong about the house colors though. I use colorvariation for all my mods and objects. Every object except the palmleaves and some parts that are supposed to blend seamlessly have their own unique color. Alarming you didn't notice.

Easy way to detect colorvariation below