I have always kept my Android phone’s flash to “Always on” mode thinking more light leads to better pictures, boy was I wrong. The story is actually opposite. The flash is there to help you take pictures in areas where there is no or less light, it is not a replacement for natural light or even room light.
Taking pictures with the flash leads to awkward light patches in the picture and shadow disbalance. You should only use flash where there is less light and you are sure turning on flash will help get a better photo. Simply put, treat flash as the last resort; not an enhancer.