I do everything on my own comic (writing, research, name(storyboarding), underdrawing, inking, toning, text, character design etc.), but I do show stuff and share my thoughts with my best friend to get a second opinion, because sometimes you become kind of blind towards how much the reader actually understands, because you know all the side stories and personalities of characters etc.
It's always good to get a second opinion at least on how 'well' it reads to others :>