Always face the audience when you light the unity candle. It makes the shot easier to get and also gives you audience a better view of this personal moment. Don't worry if it blows out either, especially with outdoor weddings. Things happen- wind blows. It just makes the moment more memorable. Also, some individuals are not using unity candles- think about different colored sand in a glass container. It works well, doesn't blow out, and also can be placed around the couple's new home, which can make a great conversation starter.