The following two are rendered in Blender Cycles with SSS, PBR shaders, tweaked HDRI lighting and volumetric lights.
This one I rendered in Keyshot with no color data and post tweaks in Photoshop.
Zbrush flat color, AO, SSS, Spec 2x, Depth, Shadow and plain wax matcap BPR render passes composited and post in Photoshop. the other ones are taken directly from Zbrush workspace (with a tasty PS tweaking) during the sculpting and painting proccess.
