口元に微笑を漂わせながらの英語

with a smile at the corner(s) of one's mouth

A smile plays about one's lips.

She has a smile on her face―has a smile playing about her lips.

A smile plays on one's face.

the act of smiling with only one side of the face

A smile plays about his lips.

with smiles

He entered with a smile on his face.

He said so with a smile （on his face）.

She said so with a smile on her face.

grin from ear to ear

a compelling smile

to make a bright, happy-looking smile

His face was beaming with smiles.

He has a joyful smile on his face.

of one's facial expression, to appear calm

wear a smile

He said so with a smile.

a happy face wreathed in smiles

a triumphant smile

He smiles his face into wrinkles.

a sunny smile

a tentative smile

a transient smile

She said so with a smile.

without smile

an impish smile

an arch smile

a distant smile

an inscrutable smile