His face relaxed a little at the sight of the change in Francisco's.
He seemed to be thinking hard about something; and then, his face relaxed.
His face relaxed, as if he'd heard more in her voice than she intended.
His face relaxed a little just because she'd reached for him.
It was the first time I'd seen her face completely relaxed.
The older boy looked him over, then his face relaxed a bit.
His face relaxed so that he looked little more than a kid.
His face relaxed then, almost to the point of smiling.
Every time he let his face relax it came back.
His whole face relaxed then; he had recognized her voice.