Use a flashlight from a different phone to light your subject from an angle will result in a better image than relying on your smartphone camera’s flash. You will achieve a more crisp picture.
You can optimize your smartphone camera’s ability to focus and meter light by tapping on the screen before you shoot. Tap a dark spot in the shot to make the image brighter or tap a bright spot on the screen to darken it a bit.
Shoot in landscape mode and your photos will look better on the Web or your PC screen.