I have written a modest tutorial on how to build realistic-looking planets with Povray using two images and 60 lines of code. If high-resolution image material is used, the results look better than photographs taken by amateur astronomers with the most expensive equipment in the world.
Two new pages for my somewhat empty Povray section, which deal with the topics of tutorials and freely accessible script-collections. Both listings are still small, but if I find new websites, I will add them. Let's see where that ends.