Couple things. First use during a time of day when it's really cloudy or even in a dimmly lit room. ISO on 100. Then I take it to about f8-f11. Try not to have anything close behind the subject. Use the flash. Shutter about 1/60 or a bit faster. Get the camera somewhat close to the subject, but make sure the flash doesn't get blocked. Take the shot metering on the subject. What happens is the flash only has time to reflect the subject. By the time any other light comes back to the sensor, the shutter is closed.