I've been using Photoshop since I first discovered it in 1992,
though I really didn't get into using it for coloring of pictures until I went
to the Art Institute of Dallas in 1994.  Now I do everything with
Adobe Photoshop (and occassionally run some effects through
with Fractal Design Painter)!  For more information on how I actually
do this, please visit the CGI Tutorial which is availble through the
bottom menu.