Wow it looks really neat! Great effect! As for programs to paint on models directly, I would suggest you took a look at Blacksmith3D. The paint part of that program is meant for exactely that :o) It's not like Bodypaint3D of course, but then again it's much cheaper, too. People often think of Blacksmith as "just" a morphing program, but it's actually a lot more than that. And no, I'm not affiliated with them in any way. I just treated myself to the Suite and have had such a lot of fun with it :o)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.