Not really anything we cn comment on, at best a very poor renderings and I would like to see amuch better one.

Even in a modern home, you'd probably want windows to be recognizable as windows and the three horizontal slats on the ground floor don't -- at least not in this pic.

In addition to the window to the right of your door ...

Not a huge fan of angled walls, interior or exterior, and your left front corner appears to be that. You should at least consider how that will affect not only building costs to create angles but also how it will affect how you place your furnishings in your new home.

My personal preference is to use only one material as exterior siding, unless the different siding mostly extends all the way from the bottom to the top of one tower or wing or section of the home -- others disagree. You might rethink that upper left corner.

Is that upper row of rectangles a row of windows in a third floor room? My personal preference would be to have all the windows the same style even if not the same size. Unless there are privacy/security issues, you might consider larger windows. While some modern homes have few windows, the designs I'd prefer do have them. It's a matter of individual taste.

If you're going to have a flat roof, then, building codes permitting, consider having a means by which you may access the roof from within the home (not just a fire escape) so you can take full advantage of the roof space by creating a private green patio there. An angled roof on such a room could help you create the modern look you seek. This roof use option may well require not only a room on roof level to enable you to access a stairwell but could also require different or additional roofing materials so it can withstand use as a patio. Talk with your architect and/or builder about your options in this regard.

This might inspire you:

[https://www.houzz.com/photos/old-fourth-ward-custom-modern-home-modern-exterior-atlanta-phvw-vp~6919273[(https://www.houzz.com/photos/old-fourth-ward-custom-modern-home-modern-exterior-atlanta-phvw-vp~6919273)

Is this facade part of a plan for a new house? What country are you in? Are you working with an architect or designing this by yourself?

aichoucha, what's your budget and what safety considerations do you have? Also, what is your climate (though I might hazard a guess), and what do you have for heating and/or cooling particulars?

Change the balustrade to something more modern. The tile roof definitely gives it a certain style that isn't modern but not sure you can change that. looks like a lovely property.

in order to achieve a modern look I should put windows that are not symmetrical?

Wrought iron-barred windows in a multitude of new openings--symmetrical or not--will make your home look more like a prison than anything else.

You want a modernist look? Consider the Mies Van Der Rohe-influenced facade below. Light, but no entry or exit.

But for consistency you'd have to change the roofing and the balustrade and the recessed facade.

Best yet, have your architect or designer work with what you have.

This is what we achieved so far but I guess something is missing in the exterior look... Help please..