A line furrowed her brow.
Deep lines furrowed his forehead, and his skin was browned and weathered from sun and wind.
Parallel lines furrowed her broad forehead and her eyebrows shadowed her blue eyes, turning them navy.
Beside him, Kim was concentrating fiercely, a single vertical line furrowing her forehead.
His face was grey and lines of grief furrowed his forehead.
Gray flecked his dark hair, and two vertical lines furrowed his cheeks.
Above his closed eyes, lines of concentration furrowed his brow.
A line furrowed Keiko's otherwise smooth forehead.
Two perfectly parallel lines furrowed his brow, never relaxing.
A line furrowed Svarzkova's brow.