Using Zbrush for Visual devellopement

I'm currently doing some test at using Zbrush in a character design pipeline, Testing some insert brushes, I'll be probably focusing on sculpting and designing creatures for a few weeks, it's a lot of fun and the only downside is the rendertime !
Detail view
Render passes used to shade and color the model in photshop, I had trouble compositing the passes comming from blender cycles, (DIR+IND)*COL wasn't really close to the beauty result, the strange thing is that it's working fine in nuke, (maybe I need to plus the DIRectionnal with the INDirect passe together before multiplying the result).

ZBrush's BPR look really useful for fast concept renders