I dont pp as a rule. I did on one of my images only once. Not because i dont agree with it, like the others have said its the artists finished product that counts, not how they achieved it. I only dont pp because quite frankly i cant do it lol. Im absolutely hopeless at it and my images always look worse than before i started. I got lucky with my watercolour rose, but that was only using blur and a softening tool around the edges. If you can pp, then i say go for it. Anything that makes you happy as an artist and makes you happy in your work results cant be wrong :)