Come to think of it: "Shave a Yeti today" would probably hit the punchline just as hard and immediately becomes imaginable, hahaha. Tons of pixies, harvesting fur from a sleeping Yeti...that's like one of them frat-boy pranks, but with purpose, hehehehe!
I like where the BW version is going. If you could somehow hide the impression of it being a sort of "edge-detect", it would look very, very cool indeed!
One way could be to go to the most obvious places and rather trace those, but take over larger textures that "could be anything", sparing tons of work and hopefully hiding the nature successfully?!