Hello! I'm trying to make some mountains for a map I'm working on in GIMP, following along with RobA's Simple mountain tutorial, but everything I make keeps coming out really harsh, the mountains look alright themselves, except for the border where they start doesnt seem to blend in with the ground at all. I've tried re-adjusting the levels and curves for the different layers, but nothing seems to come out quite right, and I've gone through the tutorial thrice now. Any suggestions?