This is simply a two layer effect where the top layer"guest" is isolated using a layer mask.
The bottom "arty" layer was a product of "the bottom layer" rendered by an action (free and "beta" at the moment) called
"Insta-sketch" by Mike Finn. It can be downloaded here:
http://homepages.slingshot.co.nz/~mikefinn/action.html
BTW: On the right images the action noted above renders some terrific "sketch-like" effects... It achieves some of the best results I've seen by actions of this nature.
~Danny~