If your camera is taking pictures but they aren't coming out clear, likely the lens needs cleaned. Fingerprints, dust, and even makeup smudges can result in blurry pictures. Use a glass-cleaning cloth or a cotton shirt to wipe the lens of thoroughly. If your pictures are still blurry, check your camera settings to see if anything is out of the ordinary. Adding a flash for pictures in dark areas generally helps with the clarity of the picture.
If your camera is not taking pictures at all, there could be a problem with your touch screen or with the camera itself. If you're having problems taking pictures entirely, check out the [[Samsung Galaxy Tab 10.1 4G troubleshooting|troubleshooting page]].