I have a suggestion. I don't know what camera you are using, but try a few slow sync shots. Frontal flash lighting is harsh, and does little to add atmosphere to the photos. Your camera may have a slow sync setting, or you can manually do it by selecting a slow shutter speed (1/30th or slower) and turning the flash on. This will capture more of the ambient light, in addition to the flash. Just try a few along with your normal shots. You may like the effect.