Wiktionary
long face
n. An expression of sadness and disappointment or gloom.
Usage examples of "long face".
His long face seemed thinner than ever, and his open mouth a stranger's.
In fact it was only his hair that was tousled, but it was tousled to such an extreme degree that it seemed to draw all of his long face up into its distressed chaos.
A Duros looked up through holographic displays of data, his long face wearing an expression that was even more morose than usual.
Jammer cradled his hand in his lap, on a blue-striped towel from the bar He had a long face, the kind of beard that needed constant shaving, and the hard, narrow eyes of a stone professional.
At last he spotted Hiramus almost at the rear of the vehicle, sitting bolt upright with a sour expression on his long face.