The letter size 300 dpi version took about eight hours to render with the final settings, preview settings for global illumination turned out at 45 minutes. Basically, it's four lights: the key light to the top left and two rim lights in the colour of the fire in the background. For reflections and a bit of fill lighting I have used greyscalegorillas HDR studio rig with the "Diva Studio" image, which I can highly recommend.
The rock is from turbosquid, apparently someone took his 3d scanner to the woods :)
It's the physical render then with settings at "medium" quality.