If you are interested in Dust maybe I have found an interesting painting tutorial for you:
Biohazard Painting posted a nice tutorial for the Axis Light Walker "Hans" on his blog. The picture on the left shows the finished model and is directly taken from the article.
He also has some other tutorials on his page (at the moment mainly for Sedition Wars) so maybe you can have a look there too.
So long,
Paradox0n