Back Lighting is a flattering dramatic lighting style. It can be effective for covering skin blemishes due to the generally soft portraits it can produce. Since the light is coming from behind the subject, lens flare is typical, but accepted.
The main light should be a large light source or a smaller one aimed at a white background (effectively using the background as the source). The portrait can be taken with a reflector providing fill light or without a reflector for a silhouette effect.