Concept Art: Alien World - Basalt Columns - Volume and atmosphere -Light interaction

Concept art sketches and Volumetric render test for a undisclosed project. The main goal of the project is to skecth and test the interaction of volumes with light, objects and shadowing. These concepts are made inside Isotropix Clarisse iFX. Clarisse's volume rendering is just pure beauty.
The tests are nice enough to be posted here. I hope that you like it. :)