Personally, I would use a vector art app, like Illustrator, to produce all the "swirly" lines and stuff. Photoshop is not much good at line art. There is a good plugin for Illustrator called "Array" from Panopticum for this. One trick I have used in the past is to "trace" the bitmap into vectors, and then drop the fills, and re-overlay the vector lines over the bitmap, so you get lots of fine lines. I would also reccomend you do the artwork in a high resolution as otherwise you will lose all that hard earned detail.