This is my 1st test upon acquiring Octane Render (and after being impressed by the demo version).
The 3d elements or texture maps are not done by me, the scene is a default in V-Ray setup. Though Octane has the tool to "auto convert"...it really doesn't do it perfectly (or to my liking).
So for MY testing, I tweaked and reworked the shaders. Practiced and learned more.....and here's my take on it. (Hopefully putting a bit of a twist to what most, if not all of you have seen)

rendered on a GTX 970 + 650 ti.. 1200 x 900 @ 15 mins.
other credits: 3d scene base in Vray ... https://www.scenected.com/