Your rendering looks good. Are planning on painting the brick lower level?

Although I also could see your house in all creamy white board and batten with the original brick.

Here are some board and batten houses.

Our Work · More Info

Water's Edge, Lake Chatuge · More Info

Modern Farmhouse - Durham, NC · More Info

IMO the house is squat based on this new rendering, so I would NOT create a white line at the base of the gables. I would run the the board and batten onto the gables and maybe only use shakes at the very top if at all. See bottom image for inspiration. Gables will need vents, maybe work white louvered vents into the design like they did in the bottom photo.

I would also do white garage doors.

https://www.prowoodmarket.com/Gable-Bracket/

Here is a source for gable brackets

I like board and batten on the gables.

Depending on where you are located, you might want to consider white barn fixtures for the exterior.

What does squat based mean?