She smiled, and it felt as though her face had cracked.

Her face cracked in a thousand lines when she smiled.

I thought his face would crack if he ever did that.

He looked puzzled for a moment, then his face cracked into a grin.

The Russian's face cracked into an understanding smile and he walked away, leaving them alone.

He grinned so much I thought his face would crack!

He looked at Ferguson, whose face cracked into what might almost have been a smile.

It was a strange feeling; after all the crying, he felt as if his face might crack.

A grin broke his hard face like somebody had cracked a rock.

She tried to smile, but it felt as if her face would crack.