Do what @Roycru does and ask random people on the street.
Claghorn is correct. If you are not with someone who can take your picture just ask someone to take your picture.
Pictures taken in mirrors never come out well. Every so often, I take a picture in a mirror to confirm that mirror pictures never come out well. I usually don't post these mirror pictures, but here's one of my mirror pictures so that everyone can see how bad mirror pictures always are.
It's a picture that I took in a mirror in the bathroom in one of bedrooms in a private railroad car.