hes sabes don't get upset, but critique is a very valuable and essential part to growth, sometimes the best ideas on how to make a piece better come from someone who isn't you.
I don't agree that you can't grow without outside help, but if you really want to flourish i'd take all the critique you can, trust me it's one of the most helpful things in the world, and what sucks is if your good at what you do (which you are) then it won't be easy to get good constructive crit all the time, alot of it will just be ego strokes and whatnot. And if someone badmouths one of your works, find out why and improve on it, if they don't give a good reason than their an idiot and just ignore it.
I personally love it when someone absolutely tears a piece of my art apart in a critique, well it sucks because they didn't like it, but it's the best way to figure what you need to work on. :-)