Not very easy to do especially since the extension has been done out flat. I prefer the facade to have differing depth to the facade as it adds some perspective to how the house looks.

If you plan to try something to doesn't make the facade flat looking, do take note that the front is square and the roof triangular as it would limit the selection of what you can do with you facade.

One way you can add privacy and add depth to your facade is by building a jut-out timber laid vertically or wire-mesh cage that extends from your ground floor and goes all the way up to just below your roof line.

Timber stripped design will help you add a more natural tone to your facade, whereas the wire-mesh option allows you to grow flowering creeper plants to also soften the facade.

Plus it acts similar to a grill. Do not put the timber horizontally laid unless you wanna create a ladder for ppl to climb.

Something like the following dude... if you look at the right of the house, what this owner has done is something like a cage, a variation of this should fit your place. Hope that helps.