Now for some colours. Right now I want a topological map showing the heights of the land. Green is for sealevel heights; the colours go from brighter green to yellows, ochre, browns, and the highest mountains will become grey, then white. This is standard, anyway; you might want to try other colours. I keep the outlines on a separate layer set to Multiply and lay down flat colours. I keep the landmass as a selection made from the outside of the linework, and the water on top. I roughly blend the colours with low-opacity brushstrokes, and then put several textures (rust-stained paper, acrylics paint strokes) over them to provide details. I use them on low opacity as Overlay and Soft Light layers. After that, on a new layer I brush in shadows on the lower right sides of the mountains, and use some of the texture details to put in even more mountains. I fix up the rivers with the lasso tool and add some more. I could of course texture the water as well but find it too distracting for no...