Morning

6.30 AM, the horizon is a perfect line, no mountains, no trees, the plain seems quiet, pending standing(?) in the eternity of time. In that serenity, wild life is waking up.
We are driving north, and there are only two artificial things in the surroundings: our car and the road. The pure fresh air is perceptible although even through the closed windows. The sun seems to rise on our left, and by the at that moment we only can perceive the sky getting bright and the grass getting green.
Oh! divine Sun, bringing life and colourful delight to our eyes!

Beautifully written. My corrections are in red and my suggestions to sound more natural are in blue/grey.

Morning

6.30 AM and the horizon is a perfect line - no mountains, no trees. The plain seems quiet, waiting in the eternity of time. In that serenity, wild life is waking up.
As we drive north, there are only two artifitial things in the surroundings: our car and the road. The pure fresh air is perceptible even through the closed windows. The sun seems to rise on our left. At the moment we only can percieve the sky getting bright and the grass getting green.
Oh, divine Sun, bringing life and colour delight to our eyes!

[Excellent description and imagery.  Make your sentences shorter.  Each complete idea must be a separate sentence or joined with 'and'.]