aA beautiful night A beautiful night

a beautiful night a beautiful night

Usually, titles have capital letters. A beautiful Night

The sun was falling, the wind was breezlowing. The sun was falling, the wind was blowing.

This sounds better to me

The sun was falling, the windand there was a breezinge in the air. The sun was falling, and there was a breeze in the air.

"and there was a breeze in the air." You don't have to use "in the air" but, having read all of your text before correcting, I picked up on your nice descriptive style of writing, and I felt that "in the air" could be right here. I hope that is ok!?

I sat on an armchair, reading a book with the music on. I sat on an armchair, reading a book with music on.

After the sun disappearinged, the sky became green, then blue. After the sun disappeared, the sky became green, then blue.

After the sun disappearinged, the sky became green, then blue. After the sun disappeared, the sky became green, then blue.

A star showed up at west, iin the West. It was so bright. A star showed up in the West. It was so bright.

A star showed up atin the west,; it was so bright. A star showed up in the west; it was so bright.

The scent of magnolia × alba flew witthrough the wind, it smelled good. The scent of magnolia × alba flew through the wind, it smelled good.

The scent of magnolia × alba flew with the wind, it smelled good. The scent of magnolia × alba flew with the wind, it smelled good.

I'm not sure what "magnolia x alba" means. I am referring specifically to the use of the "x". The phrase "smelled good" is very informal English but the use of "good" like this is common in everyday English. An alternative to fit in with your descriptive style could be: "it was a wonderful smell" or something like that. A little tip: you may wish to avoid using the "smelled good" type of writing in more formal or richly descriptive settings.

When the wind fblew overthrough/in the tree(s), the leaves shook like sand. When the wind blew through/in the tree(s), the leaves shook like sand.

When I looked up, the sky was cloudless, there were so many stars. When I looked up, the sky was cloudless, there were so many stars.

When I looked up, the sky was cloudless, there were so many stars. When I looked up, the sky was cloudless, there were so many stars.

I felt like I was in a boat flowating on the sea. I felt like I was in a boat floating on the sea.

I felt like I was in a boat flowating on the sea. I felt like I was in a boat floating on the sea.

The wind kept breezlowing, the stars kept shining. The wind kept blowing, the stars kept shining.

The wind kept breezingbreeze continued, the stars kept shining. The breeze continued, the stars kept shining.