Now for the clear unmasked bit I'm going for a blue marble. I've never painted marble before so I did a test on an old scrap shell. The paint I used was the only airbrush blue I had so it's a peal blue/purple. It's rather nice though.
Are some good guides and tips for painting marble.
Also keen eyes will also spot a new project in the background. That shall be posted soon once I have enough to post here.