Thanks for the coments Jaxilon and ravells. =)

The collor of the montains is easy to change, I'll try some others tones.
But I'm all guilty by violating the river physics, I know it have weird behavior and I knew that while I was creating, but that is how the original map was, the one my DM created so, blame on him.

And about the Oldguy's tutorial I don't used it exactly like it was described, I made some changes because my map was too big and I noticed that the Oldguy's tutorial dont work very well for high resolutions. I guess some people was talking something like that in other threads.

I'm thinking in aplly some snow on the mountains, but for some reason when I save the file the mountains change its deep/behavior, I dont know why. But well, chocolate mountains with cream on top would be nice. XD

Thanks again, the forum is so nice and the people here seems cool. Talk to you soon.