Perhaps we should look directly at the current exhibit,
National Photographic Portrait Prize (20 March - 24 May 2009). 

There are close to 60 images ... all should be reviewed to get the full picture. 

I don't yet know if the images on the NPG site are better/different from
the ones in the originally cited news article, 

The entire site begins here ... National Portrait Gallery.

Comments, please ...

--Martin