I realized the other day that it's been more than a decade since I drew a ninja turtle.
Time to fix that:
Before I started this, I looked at a bunch of pictures of regular, non-ninja turtles. I learned something important: Turtles are freaky looking. They run the gamut from sort of weird looking to tremendously horrific. So it stands to reason that a mutant combination of a turtle and a dude would look equally horrific.