He looked up at her without a trace of a smile.

Was there a trace of a smile on her face?

There was a trace of a smile on her face.

A trace of a smile crossed him, and he turned away.

A trace of a smile was on the old woman's lips.

She asked the question with a trace of a smile.

Then all traces of a smile ran from his face.

There was no trace of a smile on his face.

In fact, he'd given me a trace of a smile.

The trace of a smile passed over the young man's face.