I am not satisfied by the effect, but I will not work on this any more. My computer is choking on the scene so much that I can barely work on it.
Click on image for larger version.
I was trying to use the scratch marks as bump-maps, in hope of making the scratches more like scratches. Sadly, I don't know how to do it when using texture nodes. After few hours of messing around, I eventually gave up.
I don't think many will get what the picture is portraying, because of my bad skill, So I will explain it a bit. The marble pieces are Hong Kong Island and Lamma Island. I used them to represent Hong Kong, since I think that they are quite recognisable (which might actually not be). The red smoke on the left is a sandstorm, in red. The marble piece is being scratched and damaged by the sandstorm.
