One way to pull a design together is to sketch its basic form without tacked on embellishments (like the huge brick portico) and wrapping forms around each other where possible
I always use a simple arbitrary color (yellow is a good one) to help distinguish the main building form and I use parallel lines to show the slope of the roofs (like rafters) but none of that should suggest in any way what the final colors and materials will be.; that's for later, right now I'm trying to understand the building and find opportunities. If you even think about those choices at this point you will be lost. This is not like assembling a wardrobe. If you get the forms right, the rest will follow.
And remember, you will never see the house from the air; its just a helpful viewpoint for studying the house. And you'll never see the house as shown in the elevations; they're for the contractor as evidenced by the riduculous red things on the windows.
I send my clients the 3D model so they can rotate it but not edit it. And I never give a client anything in black and white.
Q