Need help with sky/ground color reflecting on building please :) W.i.p.

[Digital-Seed]

Hello all.
This is my w.i.p. Cottage on the moors (iPad Pro iOS)
It’s my first ever landscape with a building in the scene and only my third ever landscape. The other 2, the first was done with Corel Painter demo on my pc with a mouse, the second on Sketchbook, also on pc. Both just trees and mountains in the background.
It is also only my third image with an iPad and ArtRage.
As you can imagine this gives me very little experience to draw on so please forgive me if my questions seem a bit basic.
I am almost done with the sky and ground. The cottage I am only now starting to add details, slates on the roof, and I also plan to add stone work on the walls.
Moses, lichen plus lots of other details again need to be added.
But looking ahead of time, I am at a total loss how to achieve the effect of the sky reflecting on the roof and the ground on the walls.
I want to capture the vivid contrast of these colours reflecting on the building.
Any help and advice on how I can achieve this is very very welcome