She studied his hands for a long time, without saying anything.
She studied her hands, not quite sure how to say what needed to be said.
She studied her hands as if she'd never seen them before.
During the rest of the interview she studied her hands.
For a moment he studied his hands, large and square.
She studied her hands as if trying to find refuge in them.
He studied the man's hands, careful not to touch the body in any way.
He studied his clasped hands for a moment and looked up.
Then, finally, he sat in the other armchair and studied his hands.
The young woman studied her slender hands for several seconds.