The idea of the portrait itself is my great love. The questions and answers in it can go on forever and ever. It is what happens in the eyes or with a tilt of the head. I keep going because it's too interesting to stop.

I think people imitate actors - things they've seen in a movie or on TV, and before you know it, they're doing something with their face or their mouth. It's from some actor they think is cool. They might not even know they're doing it, which is kind of funny.

Does getting closer to the subject make the photograph more intimate? I'm sure it takes more than that. What comes next? The face, the nude? That's what I'd love to do. Who would even let me do that?

I never thought that my work was going to become well-known. It started happening slowly, without my realizing it. But when I did, it was terrifying. I still can't believe that people let me photograph them. The trust is amazing. But I've always put them in a context that is dignified, and that's really important.

My theory is, the more pictures you take, the better you get. It's like a sport. I never wait to get a particular shot because wonderful accidents can happen when you shoot a lot.

Shooting great-grandchildren of some of the people I had photographed in the past, who are around the age of 15, is fascinating to me, because they're right on this fine line between still being children and starting to become themselves.

I know now that before I take a picture I have to be sure about how I feel about the subjects. What I don't know is if I should explain to them what I'm doing while I'm photographing them.