Meanings of sullen beauty in English

She propped herself up against Anthony's wall and smouldered there in her dark, sullen beauty.

She was healthier and robuster looking than the others, and her weather-beaten face had a certain sullen beauty.

And between them hangs a photograph of the musician Frank Ocean in all his tensely sullen beauty, the diamond dull in his ear.

This is a movie about a depressed Hamlet, though the adaptation itself has a mischievous and stinging intelligence, and its own kind of sullen beauty.

She imagined him engaged in wild romances with sullen beauties.