Twilight!

I like birds chirping, and Earth's beautiful smell.

Earth the planet or as a whole should be capitalized, but if you meant more like dirt, you can say "the earth's ..."

The sun is dim not very vivid.

I like morning's sunshine; it's bright with fresh air.

I added "it's" because you used a semicolon after "sunshine", separating two independent clauses. Except the second clause wasn't independent, so I made it so by adding "it's."

You could have used your sentence without change by using a comma instead of a semicolon.

Isn't English maddening?

The landscape looks is filled with full of brightness.

Your original sentence isn't wrong, but it isn't the way we would say it. If you use "looks" you are using the word in the sense of "appears." But the word "appears" leaves open the possibility it isn't filled with brightness.

So, if you want to mention how bright the landscape is, you would say "is" and then describe it as it is, "filled with brightness."

I like morning's sunshine, bright with fresh air.