Thanks for the wonderfully detailed comments, RobA! You're totally right, I should have mentioned Inkscape. It didn't even occur to me at the time since Inkscape and I don't get along well at all, lol. As for the mountain layer, I had toyed with the idea of making it darken-only for that same reason, but I didn't even know Behind mode existed! You truly are the Gimp-maestro. I'll post up a couple of corrections soon