You can hold shift + left mouse button drag to change the light angle. It will show the fibers within the orange. I achieved this by editing the normal map, no sub surface scattering is used.
Inspired on concept art for Rayman Legends by Jean-Brice Dugait
Thanks to Xue – Lin van Rijn for helping me with the tower design!
For the items below: all rights reserved to Cyborn
Everything by me except the light flower pattern on the moss
(please watch in HD)