Sweet! Well done Frank! I wasn't sure about it when I first saw it on your flickr, but now that it's done I think it's bad ass!
Excellently done Frank. Although I appreciate that you have amazing painting skills, I actually prefer it without that much extra detail, as in the progress shots from your flickr. The black around the teeth especially is a bit too much I find, for example. I prefer tighter/thinner lines around the teeth and mouths. It all depends on what style you are into though of course. But I am blown away by the execution and your creativity in bringing this guy to life. Now that you've seeded the thought, I can see a lot of potential for MOTU inspired paint schemes, such as on a Shuttlegon or MPC.
Ahhh! Awesome! Whenever I see a two-headed sofubi, I immediately think of Two Bad. He is a toy from my childhood that I still own and have always loved. This is a great homage and really well done!