Kenneth Manlangit sent in this photograph. Kenneth was using his speedlights and has done a great job working with a new technique. There is a lot to balancing the ambient with the flash without overdoing the flash look. By using speedlights Kenneth has brought out detail in the face that would not be as clear without the fill flash. The flash spills over a bit onto the background, if this was not the intent just dial the flash back some. Using a snoot on the flash can also isolate where the light lands. To really pick up some great tips check out Dave Black's site, his Workshop at the Ranch and On the Road have detailed explanations of his work with Nikon speedlights, Strobist is also full of ways to improve lighting using off camera flash As to the photo itself, I would crop off the bottom where the dress has caught too much light. I would also consider a vertical crop filling the frame with mostly the main dancer and a little background.