The Trembling Man Reading

As she walked past and noticed this man
He rose his face and smiled:
"Hello" with a dirty brown gap in his fronts.
Glancing at the loose letters in his book
She wondered if he was trying to learn
English or how to read,
But he was trying Chinese healing -
He was so surprised she inquired,
His eyes big
Smile eager to show her the healing wheel.
And she noticed these things,
But as he told her she was very beautiful,
His bottom lip trembled hard.
Was it fear? Was he nervous?
She left wondering why that lip shook,
Seeing a little learning boy, her heart broken, wanting to cry.
Why does beauty make lips tremble?
It seems too harsh an effect.