For my interpretation I tried to stay as close to the source material as possible, so the original character kind of shows through more. In fact I started on the base mesh of Blastoise ripped from X and Y and sculpted on him from there using Zbrush. I also rendered in Zbrush and finished up the final image in Photoshop. I based some of the details of Galapagos tortoises, terrapins and alligator snapping turtles. The arms actually can from an unlikely animal - an actual mammal - the armadillo!