This is a caricature I did recently for a friend and real inspiration of mine.
Gregg Tipton is the founder and director of Ten Days Missions http://www.tendaysmissions.org/ , the organization we recently went to Baja Mexico with. I wanted to try a colored line technique I’ve been working on, as well as a bit more layered, watercolor look to the coloring. Hope ya like it!
Keelan Parham.com 
Very Cool Cartoon and likeness Keelan!In answer to your question on my blog about the T-shirts. It IS a Sharpie, but the sharpie called the "King" works the best on material (with chisel tip).http://s7d5.scene7.com/is/image/Staples/s0067148_sc7?$sku$I didn't know until I brought all my Sharpies along and found myself using that one all the time! Good luck and hope to see you at Con!