He paused, utterly miserable as Logan's expression changed and sharpened before his eyes.

Mrs. Marshall's expression sharpened and Michelle knew she'd gone too far.

In spite of her best intentions, her expression sharpened, seeing that.

Now she saw Isambard's expression sharpen, and braced herself for his response.

He looked at me and his expression sharpened.

His expression sharpened, but he kept his smile in place.

Her expression sharpened under the ridges.

He started towards her, and his expression sharpened into a grin of violence.

She breathed raggedly again but her expression sharpened.

Nasuada's expression sharpened into that of a hunting wildcat.