Original concept art was by Thom Tenery, used with permission. I redrew one of Thom's sketches from the book Alien Race: Visual Development of an Intergalactic Adventure and used it as a reference for my sculpture. The reason I redrew it was to better understand the mouth of the creature. I took the reference image into ZBrush and began sculpting the 3D model from a Dynamesh Sphere. You can watch videos of the process here:
http://youtu.be/klyqYhsnzPo
and here:
http://youtu.be/NrZdYvCCpuk
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I love modeling creatures and monsters and stuff, I don't really get to do that in my day job - there it's mostly just humans.