I came across Volomir's excellent stage-by-stage article on how he painted his Sea Guard. It was of particular interest as he uses an airbrush extensively during the process, and talks at length about how the tool is incorporated into his work flow. I am rather enamored by airbrush use in general, so it was fascinating to see how Volomir works. I was surprised to see how little masking he did, and how quickly he achieved stunning results on metals with the thing.
Check out some of his WIP shots below.