See...
http://www.stonecentric.connectfree.co.uk/avebury.html
If those are his best ones they're not very convincing to my mind.
However, to be fair to him, he says in a RealPlayer commentary you can get to from there something about the fact you can see hundreds of faces on the Avebury stones that are typically fanciful, like you might see in a fire, but the ones he's interested in are so humanlike they couldn't be chance and they can only be seen when the sun and the shadows are just right.
(Seems like a clever trick to be able to carve hard rock so as to cast shadows that form part of the image.)