I think I'll stick to doing it the way the old dogs did it. ;-) But then again, I haven't even touched my paint box in like 2 years now.
The theory behind it, and I forget if it was Roth, Kafka, or Wizard that I first read about explaining it, was that the eye will see the lightest colors first and follow those lines, now if there is a darker color over the lighter color, it will appear broken and distracting. Therefore if the lighter colors are on top, it will appear smooth and flowing, and the darker color as a smooth, undistracting, background and a piece of art all in itself.
So yeah, it's just a preference thing and it would certainly be easier in a rush to do the lighter colors on bottom
For a lot on discussion there are a couple of really good message boards out there where a lot of the old pros give there $0.02 on a lot of different topics...
SketchKult Pinstriper's ForumPinstriper.com Message BoardI know there are a couple of others as well, but SketchKult is a really good board and a lot of info and opinions can be had from there.
Plus any of Roth's old books on the subject are really good with info too. I think I've got almost all of them now, and almost all have some good info in them.
CJ