Not much more I can do for the height on the mountains, but I might try adding snow-caps. It would provide the necessary effect without overdoing the bump mapping.

About the forest brush. Unfortunately, I use GIMP, so I'm somewhat limited. I might try something with the mosaic filter. The technique I use now works great for small image sizes, but because the cloud pattern I use scale proportionally to the size of the image, it doesn't look so great on larger images

On rivers. I know what's wrong. Right now, apathy is what's preventing me from fixing them. I did them before I added the bump map, so it was sort of a shot in the dark, and I'm to lazy to update them. I'll get around to it in my next draft.