Sia is an interesting artist, known by her amazing vocals, stunning hits and a peculiar wig where she refuses to show her face. Yes, the artist refuses to show her face in public, although she has been spotted on some occasions without the wig.
Most of the time though, she stays in character with her long wig of hair covering here face. She could be doing this to stand apart, or perhaps to separate her work life from her artistic life. Maybe she doesn’t show her face as she wants to remain anonymous. The most probable reason is that she doesn’t want the paparazzi to recognize and bother her all the time!
There could be several reasons why Sia does not show her face. She may not show it because she is trying to be artistic. Other artists have decided not to show their face because they want to be separate from their art. Another reason she may not want to show her face could be that she wants to maintain some kind of anonymity.
If people, especially the paparazzi, do not know what she looks like, they may not be able to recognize her to take her picture in public.