Simple:
* She greeted me with a smiling face.
* The baby was smiling at the toy.
* He was smiling despite the bad news.
Descriptive:
* The sun was smiling through the clouds.
* The cat sat smiling with a mischievous glint in its eye.
* She had a smiling demeanor that put everyone at ease.
Figurative:
* The city smiled at me with its bright lights and bustling streets.
* Her heart smiled with joy at the sight of her family.
* The book smiled with its promise of adventure.
In a dialogue:
* "Good morning," she said, smiling warmly.
* "I'm so happy to see you," he said, smiling broadly.
* "Don't worry," she said, smiling reassuringly.
The way you use "smiling" in a sentence depends on the context and the desired effect.