Page 476

'He smiled, not looking at her; it was a mocking smile, but it was a smile of pain and the mockery was directed at himself.'

Page 417

'He waited to see what advantage Francisco would take of it now, but Francisco obeyed him in silence, with a smile that had an oddly boyish quality: a look of triumph and gratitude, together.'

Page 405

'What Dr. Ferris was seeing in Rearden's face was the look of luminous serenity that comes from the sudden answer to an old, dark problem, a look of relaxation and eagerness together; there was a youthful clarity in Rearden's eyes and the faintest touch of contempt in the line of his mouth. Whatever this meant - and Dr. Ferris could not decipher it - he was certain of one thing: the face held no sign of guilt.'

Page 345

'She saw the relaxation of an invisible smile in his eyes'.

Page 340

'There was a strange look on the man's face: bewilderment as if he had no conception of the issue confronting him, and fear, as if he had always had full knowledge of it and had lived in dead of exposure.'

Page 197

'The look on her face astonished him more than all the rest: it was a look of defeat and yet of an odd, sly, cynical cunning, as if, for a moment, she held some worldly wisdom that mocked his innocence.'

There may have been some of these earlier in the book. I think I'd already half noticed them, but this one was very memorable, and drove me to actually folding the corner down on every page where I find one.