First Exalead adds an option to limit your image search to faces, then Google, and now Live Search has joined the gang. In terms of ease of use, it is not as slick as Exalead's but not quite as clunky as Google's. You first of all carry out a search in Live Images and then add filter:face to your search search strategy or filter:portrait. If you want to look for black and white images you add filter:bw. At present you have to remember the commands but they say they are looking at how to make these features intuitively accessible through a drop-down menu or some other means.
On my image test searches on Live.com I cannot honestly say it was better or worse than Exalead or Google. None of them are perfect. They do remove most of the non-people images but all three also lose relevant faces and 'portraits'.
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