I tried a little bit of hand painting with that one. I made the low poly in maya, high rez in Zbrush, made a base projection of the crystals, then baked AO/curvature to start the hand painting job in 3D Coat (ended up not using curvature that much). Rendered in marmoset viewer.
The concept was awesome, but not from me. Unfortunately I can't find the source of it :( (found it on pinterest : https://www.pinterest.com/pin/416371928035173349/ )
C&C are welcome, hope you like it! :)