How to use "frowning" in a sentence

Puzzled, frowning thoughtfully, Vivienne put down the knife, pulled one end of the sofa away from the wall, and collected the framed eight-by-tens that were on the floor behind it

"Ah," Kennebeck said, frowning slightly.

Bob shook his head in agreement, frowning, as if he was dismayed to think that he could be mistaken for a common thief.

"Who's this guy you're supposed to see?" Tom asked, frowning.