Painting and sketching are the ways to express yourself. For some people it is their obsession, for others it is a way to relax their minds. While others consider it a way to make a connection with their inner-self. In any case sketching and painting are something intricate yet soothing and fascinating.
I believe that to display your art you do not have to be a great artist. You just have to draw you emotion and personality on paper.
Well not all people have a passion on sketching and painting. I think those are the people only who had a passion on painting ang sketching which make them feels good and give relaxation to their mind. But not the people who don't have a passion in it.