First determine your budget as this will be a massive undertaking. I wouldn't make faux windows or faux anything else. This is a modern beast that you need to soften with some textures and colors, but you shouldn't try to make it look like the house that it is not. You'll just end up with something that feels like Disneyland.

Between lighting, planting, vertical plant cable trellis', trees, and house numbers, I think you can do a lot of tame the brutalist effect of this home. What part of the country / climate is this located in? Knowing what plants and trees will thrive here will help a lot.

You will surely need to hire an architect and maybe landscape design firm. But, it does make sense to hone your vision here first so you can better know what kind of architect you are looking to approach.

I'd go for a right row of Italian Cypress if your climate is right. Then on the short right wall, I'd cover with redwood colored slats. Get some huge interestings sconces on either side of the opening so it reads entry way.

I would plant some colorful azalea bushes there and elsewhere. Here are some pics below from Pinterest.