For those of you curious to see how I Mesh out some of my details, I figured I'd throw one of my smaller .ai files out there for those who are interested (the more detailed ones get to 200 Mb or so). It's much easier than trying to put together a tutorial and I think artist learn more from exploring rather than following instructions.
It was created in CS5 using some features not available in earlier versions of Illustrator, so I have no idea what it would look if you attempt to open it in CS4 or lower.
Do what you want with the file as long as it stays on DA and completely Free
. If you create something new with it, drop me comment and link the work to my page.