This looks very good on the micro level, but not so much on the macro level ("blobby", in the author's own words). Part of what's needed is something that at least somewhat emulates plate tectonics and other real geological processes - not well enough for simulation purposes, but well enough to get things to look right to a human viewer.
To add to that list of references[1]. This example is particularly good in terms of believability - it does a good job at hiding the procedural origins and is really believable.
This is a nice description of the manual version of the process (in the context of RPG setting design): http://www.giantitp.com/articles/xO3dVM8EDKJPlKxmVoG.html