Descriptive:
* The sunset painted the sky with lovely hues of orange and purple.
* She wore a lovely floral dress that flowed gracefully in the wind.
* The old bookstore had a lovely aroma of aged paper and leather.
Complimentary:
* You look lovely in that new outfit!
* Thank you for the lovely gift.
* It was a lovely evening spent with friends.
Informal:
* "Oh, lovely, I got a promotion!"
* "That's lovely, I'll see you tomorrow."
* "Isn't that lovely?" she said, admiring the flowers.
As you can see, "lovely" is a versatile word that can be used to describe a variety of things, from scenery to people to experiences.