Try adding to the query string in the resulting search URL in your google search the following: &imgtype=face
see: http://emad.fano.us/blog/?p=556
I played with this a few times now and it is kind-off disappointing... this feature has some serious maturing to do :-)
We've integrated this feature already without having to add any code in the URL field, you can test it on exalead.com and don't hesitate to leave us your comment on our blog.
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