OK, after attempting to do the mountains in the mountain tutorialhttp://www.cartographersguild.com/sh...ntains-in-Gimp I am running into a situation where I am not getting my peaks to look correctly:

Click image for larger version. 

Name:	issue with curves.jpg 
Views:	77 
Size:	180.5 KB 
ID:	46352

Any suggestions as to what I am doing wrong?