Well, i'm doing my new campaign map and i need help to do a map. I'm trying to use the same mountain and forest style of Tolkien, because i love that, and i know that the user Ramah uses it too. So i get some forest brushes for PS CS4, but i have a problem i have to do a big, very big, forest area on the map i tried the automatic forest tutorial but i couldn't use it because the max. image size i can use on that its 1024 px X 1024 px, and my map its 3900 px X 4500 px.

So i wanna know if you know any way to do a big area of forest without spending much time. I have already tried the Automatic Forest and the clone stamp tutorial, i really need help '-'...