Look neat. One thing I personally notice with fractal landscape programs is they tend to rely too much on this idea of changing the color/texture based on the slope of the land but if you look carefully at real land with slopes this is not the rules under which its shape or texture are formed. Reason being there is no entropy or erosion or consideration of how vegetation might spread and take hold in different ways. It's too strict. Could you maybe enhance this whole idea by adding some random factor to it also?