IRay Render
Marmoset Render - Front and Back
Details
Marmoset Viewer
Concept from the CreatureBox Monster Volume Artbook : http://creaturebox.com/the-monster-volume/
Modeling done in Zbrush with ZModeler, 3D fixes and tweaks + UVs in Blender and texturing done with Substance Painter and Designer, rendered in Substance Painter's Iray and Marmoset Toolbag.