I'm afraid I must voice a difference of opinion from that of the illustrious Mr. Ferret in regards to the "cell shaded" version. I think it is by far the best version I've seen.
DMAC, your artwork is amazing, absolutely amazing, but I find the way you shade and color actually takes a bit away from the illustration sometimes. Since you have such skill with depicting solid, clean lines, the "cell shading" approach (which does not add more lines to the original drawing in order to produce the look of light and shadow) is definitely the best way to go.
Some of the best images I've seen by you are the alternate Impulse, Wonder Woman and Batgirl on your site. Clean lines and solid color give them weight, without ridding them of a slightly, "animated cartoon" feel.
As with others on this site, please let me know if you do commisson work.
Later Days,
AD