Beautiful map Anna! And that's a really nifty solution to stop the 'plating effect' in Bryce. Although I use Bryce a lot for compositing 3d models, I tried it for mapping but wasn't really happy with the result. I wrote a short tutorial about bryce mapping here but your work is way ahead of that. I also found a way of turning terrain generated in profantasy's fractal terrians into Bryce, which may be of use to you if you want to 'draw' your terrains in FT so that you can get a Bryce terrain map that is more accurate to your needs.

Cheers

Ravs