Hi there

Maybe you could edit the images in a image software applying filters to achieve it ? Would be the easyest way, altought there are toon shadres also around the forums.

Commercial plugin to Photoshop :

http://www.digitalanarchy.com/toonPS/main.html

A tutorial to do almost the same in GIMP :

http://ocaoimh.ie/2004/10/01/cartoonizing-photos-with-the-gimp/

I dont know if this is what you want.

Anyway, good luck.

ps. : Looking good, keep it up !

Cya.