"….much talked about was the smile on the otherwise grim face of President Hu Jintao when the women marched past the Gate of Heavenly Peace.
Perhaps it was the broadcast director’s sense of humour to intentionally highlight Hu’s pleasure; the camera quickly panned towards a smiling Hu, clapping his hands, when the women’s corps came into sight. For the rest of the parade, Hu appeared rather stern and wooden. "
http://www.youtube.com/watch?v=cpaDGQi6et8
at 08:50 onwards.