this guy was painted in '09, so my techniques have been refined a lot since then, but overall, i simply use the layering technique...
i start with the Trollblood Base to get nice solid coverage...
shading comes next with thinned Coal Black...
to start the highlights, i mix the Trollblood Base and Underbelly Blue, starting at about 2-1 T.B. to U.B., then 1-1, then 1-2, then pure U.B. on the very edges...
just play around with mixes on a piece of sprue or a test model, and see what you personally like the look of
you can see some of my step-by-steps for other minis in my
WIP blog, to check out how i shade and highlight...
http://www.dakkadakka.com/dakkaforum/posts/list/599549.page
the Sanguinary Priest helmet on page 1 is a good example, especially the back side, where you see a lot of contrast...
cheers
jah