Some pictures that I take are blurry
In low lighting conditions, the camera might compensate for the lack of exposure by using a slower shutter speed. If you move the camera before the shutter clicks, the picture might be blurry. If the camera is using a slower shutter speed, a Low Light or exclamation point indicator appears on the screen.
Depending on your BlackBerry smartphone model, you might be able to decrease the blurriness in pictures that is caused by slight movements of the camera by turning on image stabilisation in the camera options.