I'm taking some headshots for a friend's networking group. They want to use them in a brochure, on the web and have the option to print them out in any size. My question is what resolution should I be saving them at - 300ppi for printing or 72 for the web? Also, since I don't know what size of prints they want, I assume I should leave more "space" in the picture when taking it so they don't crop off their arms if they print something besides a 4x6. Any help is appreciated!!