I first started illustrating with traditional media; pen and ink, gouache, and airbrush, but now I entirely work on the computer. It is cleaner, I don't have to wear a mask to do my air brushing and I don't have coloured lips from licking my sable brush to keep it's point. The final job can be emailed rather than sending original art by courier. And most important of all - the computer has an undo button.
At the end of the day it's hard to tell the difference between the traditional and computer work.
I have done illustrations for magazines, books, calendars, advertising, brochures, Christmas cards, and point of sale, mainly in cartoon style, but occasionally I use other styles when the subject matter requires it.