What is it about it that you do not like?

lololol!!!!

Had a flat roof. Never again.

You have to have specifics when asking for help. What is it you don’t like exactly? For me it would be the tiny windows I think it would be awesome to see the windows wrap around the sides.In fact a bit of natural wood would also be a nice addition

It looks cold and boxy. Modern homes should be innovative and interesting. Natural light is also so big in modern homes why on Earth would your architect give you those tiny windows.

Bigger windows are definitely needed. You also need to include natural elements like wood to help warm it up some.

It also looks very monotone due to the fact that it is a rendering. No texture, no joints, no seams, everything is one piece and to consistent, or just to perfect.

We need to know a little bit more about what you wanted so we can understand why the architect came up with this answer/solution.

Meanwhile I will make comments based only on what I see - and for the record, I like contemporary, streamlined architecture.

First off, it's too ARID, literally and figuratively.

It is contradictive: The substantial entry could make people think that they are welcome but it is like the idea is to get away from the world and site it is in -those windows are telling me that- Are those electric window shutters? What I perceive is that this is bunker like home and wonder is that was the intent.

To answer your question, how would I improve it? I will need to know what was the intent but if it is to be improved based on what I think, simply put, I'd go with this:

You need a landscape architect. There is such thing as contemporary landscape.

Add windows/glassing

I'd go with a different color. Your selected color makes the house look gloomy. Just by changing the color to white will be a great improvement (or maybe a different gray)

Now, why the garage is there, that is a another subject by itself.

The facade speaks volumes . . . or at least Jones funeral service to the right, Smith viewing to the left.

Looks like an office building !

When the original poster doesn't give us any information, this feels like twenty questions, doesn't it?

Perhaps this site is on the top of a steep incline, so there was no other place to put the garage, and the remainder of the house, and lower down the hill below the part of the house we can see.

In that case, I sure as heck hope the poster has a super duper structural engineer evaluating the site and plans and every little change and maybe another one checking them, especially if you live in a seismically active area, and/or one prone to floooding, landslides, etc.

Perhaps the front of the house faces the sun, hence the small windows. But if that is the case, does that mean the entryway will be hot as blazes?

Perhaps the area has relatively little rain, hence the flat roof, as in Palm Springs houses.

The house does look awfully glum. Is it the shape plus the color plus the tiny windows plus lack of landscaping? Taken together (sans the entryway) it has a rather institutional, almost correctional institution or bunker-like appearance.

There are ways to do larger windows in area of high heat.

https://www.wbdg.org/resources/sun-control-and-shading-devices

In Australia the government pushes people to take measures to build in an energy efficient manner and use very little energy. Australia has climate zones very similar to ours. Please have a look at these articles and search for more for info that will apply to your climate area and to your home and ask your architect to have a look.

https://www.sa.gov.au/topics/energy-and-environment/energy-efficient-home-design

http://www.yourhome.gov.au/passive-design/shading

Everything is orthogonal and uninteresting. It has no life or spirit. It looks like two boxes smooshed (architectural term) together without thinking.

Other than that, it's pretty interesting...

Where is this design located? Is there something of the location and region which could be reflected in the architecture?

I would want to add some warmth with natural materials like stone, wood, and plants. Maybe something along these lines...