Ages ago, I did a fan-art of Moonrise Kingdom, here I just updated the digital version of it in my Behance : Moonrise Kingdom. Behance is improving, they changed their interface setting for user's portfolio - now we can use preview it for full version. Imagine looking at awesome people's portfolio on iMac, with all the detailing that can make me cry :F
I've been asking my colleagues and siblings to create a Behance account and upload their past works there, as their online portfolio. By far, this is the only platform that I'm comfortable to use and I've been meeting with many great clients over the past few years, thanks to Behance. If you are serious in improving yourself to be a professional designer or illustrator - you should put this into consideration.
Even if you don't have any qualification in designing, but if you have a decent portfolio, there will be clients or companies that will be willing to hire you based on your personal experience alone. I'm the living proof :D