Thanks for the comments, Ravells.

I haven't yet had a chance to read the PDF on labels that you provided, but a quick glance through it has me excited. I will definitely read this before my next version of this map.

The software I used was Gimp with Wilbur used for erosion to provide the rivers (as you guessed). I've been playing with techniques nearly all of which were garnered here in the Guild forums. I have only recently got to the point where I think my mountains look decent on a continental scale. I'm not yet entirely satisfied with them, but I'm getting there.

--Hugh