The reason this bridal portrait looks so incredible is the light. And the bride's elated expression, of course.
There’s a lot going on in this bridal portrait other than this bride’s beautiful smile. The long row of candles can be seen shining brightly behind her. I think candlelight adds so much to photographs. However, I actually added a flash behind her, which is giving her veil that beautiful high key glow. And a third lighting element is the pattern the sun is leaving along the bottom left of the picture and on her gorgeous lace bridal gown. All of these elements make for a beautiful and compelling bridal portrait.