"Do you shoot a picture of the person and incorporate that into your computer is that how you generate the caricatures?"
There are absolutely no cameras involved in my party caricatures work. The computer does not do the caricature drawing for me. My hand, eyes & brain do all the work as much as any Caricature artist does. My PC is strictly nothing more than a tool. I hold a special plastic pen in my hand, physically draw on the laptop screen & print the drawings on a high-quality printer. This YouTube link shows exactly how I work.