Test Map and question

[HBrown]

Here is a map of nowhere in particular that I made using techniques I just learned from this forum. I'm reasonably happy with it as a start. I used GIMP and used Wilbur to add the rivers. I'm not satisfied with a couple of things:

1) If I look at a real map, the mountain ranges are often wrinkled - more-or-less parallel tight folds. I'm going to continue to experiment until I figure out how to achieve that effect.

2) I'm not pleased with the GIMP solid noise rendering. It exhibits linear artifacts and a regularity to the lumpiness that I find detrimental. I spent a lot of time on this map blending together layers of solid noise to try and reduce those artifacts. Does anyone know of a better cloud filter? Or a better way to use GIMP's to minimize its shortcomings?

Thanks for any comments,
Hugh