Hello Abdi,
A light system doesn't have to be fancy or sophisticated, a simple cheap floodlight will work if there is enough ambient light in the room to lighten the shadows. If used at night or in a dark room a flood is too harsh and the shadows too dark. Camera mounted flash is totally unnatural, and has the look of a snapshot. No one ever sees a person in real life, with the light that a camera mounted flash produces. If the flash is used off camera it's acceptable.
Steve
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