Unfortunately shaded relief maps are more difficult to make  Simple representations can be made in photoshop but dont look that good  The high quality reliefs such as the google one are essentially full D models with the shadowing calculated and rendered based on the shape of the terrain  I have played about with spot views in the past but only for testing purposes  Even then it was a lot of playing about to get it to look good  for something the size of SA it would be very very difficult  Unfortunately I cant take the google image as a base as it is fully copyrighted and thus not suitable for uploading under a free licence