I have 61 hubs and more than half of my portfolio is on them in one form or another. I have a website specifically for my portfolio that I can direct people to but for the most part I have put most of my work in files that can easily be sent via email. Of course I have a hard copy portfolio but most clients I deal with is through email.
I have a job as a graphic artist, so I do that 8 hours a day and write hubs for fun and add graphics and make illustrations for my Hubs. For example subheads can be loaded as photos and spice up your hubs.