Procedure to do a map like that?

[kaahen]

Thanks very much for your answer, I have things clearer now. I did the bump map using the channel and the lighting effect. It looks good, but what happens when I want to make more than a bump with this method at the same layer, should I duplicate everytime the layer and add transparency?

Also thanks for this solution to scale clouds, I don't like it, but as you said is a way to do it, I knew that Gimp does it perfectly touching the parameters.

I finally located the sandstone, I also will check it.

[jfrazierjr]

Thanks very much for your answer, I have things clearer now. I did the bump map using the channel and the lighting effect. It looks good, but what happens when I want to make more than a bump with this method at the same layer, should I duplicate everytime the layer and add transparency?

I use GIMP and some of the processes are different of course, but I rarely add a bump map to a color layer for this exact reason. Typically, I create a layer of 50% grey set to overlay mode and then run the bump map on that layer against whatever noise layer. This allows multiple different bump maps to be chained together to get a specific effect.

[Ascension]

To me the mountains look like a granite pattern that was then bumped (layer of 50% gray set to overlay then use the dodge tool for brighter/higher spot and the burn tool for darker/lower spots) with some red airbrushing in places. The lake is, as RobA said, a distort filter with a lil extra bumping or plain old airbrushing. The forests look like a textured bevel or a lighting effects applied to many renditions of difference clouds with some rusty spots thrown in to break up the color. The grass looks like a lighting effects applied to some clouds with added noise and then inner beveled around the water or possibly bumped because there are some subtle hills. Looking at it some more the grass could just be a textured bevel as well...not sure what the pattern is but something like blurred blobs.