As a photographer:

— Make sure to set focus and exposure properly. To set focus just tap on a needed area on the screen. If you see overexposed areas in the frame tap on them to change the exposure.
— Use the flash in the dark.
— The more you experiment, the more creative your pictures get. Try out new angles, locations and light conditions.

As a model:

— For the best image quality we highly recommend using the main camera of your device, not the front one.
— If you don't have a tripod or a selfie stick try duct tape, books, wires, tree branches, whatever is on hand.
— The more you experiment, the more creative your pictures get. Try out new angles, locations and light conditions.