In Italy we say FARE UNA FOTO, so don't translate literally from English "to take" (prendere) and remember to use FARE. If you want a picture of yourself you can say: FARMI. If you're with someone else you can say FARCI (a picture of us). If you want to ask someone: "Can I take a picture of you?" in Italian, you can say FARTI (one person) or FARVI (more than one).