This was one of many pieces I did for the LA Weekly in 2010. More of a WIP breakdown than a tutorial but you can still see some of my process:
From thumbnail to sketch.
From drawing to graphite tones.
I worked a little differently on this one, laying in all the tones in graphite rather than ink and then washing over with gouache and building it up from there. I have to say, I love the control and detail of graphite but the tones are not as smooth as with ink (duh). I think my ideal would be a mix of both.... next time...