There's a great little video on this subject by Roger Ballen[1][2] called

"You may be a photographer, but are you an artist?"[3]

[1] - https://en.wikipedia.org/wiki/Roger_Ballen

[2] - https://2.bp.blogspot.com/-G-SJBxGskBg/T_7C3kB4awI/AAAAAAAAA...

[3] - https://www.youtube.com/watch?v=sieUlqQIxT8