ah, still plugging along with the 1.23 demo… this is a robo face concept of which I had done one side painted with Brush then used another app to copy flip and fade…
Hey G, you can copy the layer in ZBrush, Flip the layer horizontally, and then use the slider in the layer panel to offset the layer horizontally…
Then you merge the layer down, and do whatever you want to the image…
Just a little Z-Thought! 
Haha, thanx for that, only about a bazillion things I have yet to learn…
Very pretty in an interesting sort of way. This is really great! Very sharp render, and I love the purplish (eyes?)