If you want clients to pay big bucks for your work, they need to understand what goes into it -- in other words, your process, which is one of the things that sets you apart from anyone else offering the same "deliverable" or outcome.
But how do you show your process?
Through your portfolio, of course!
(BTW, another excellent way is through case studies.)
Jason Fox, Executive Director for Academic Services and former Chair of the Graphic Design Department at the Savannah College of Art & Design, demonstrates how to use your portfolio to show more than the final outcome, in one of my favorite sessions from a recent HOW Design Live.