I have a question on back-grounding. How deep should it be? Is the intent to set it well back so the figures are almost in relief or are you just trying to rough the surface so it will take a dye or stain adding texture to the background? Similarly what is the intent with pear shading? This tutorial is very helpful and I think I can now get a good effect with scrolls but what am I trying to achieve when I move on to roses and oak leaves?