this is possibly one of the coolest sites I have ever seen. You can set up an account for free and they will actually give you a space to post digital portfolios of your work that you have created. These works are all organized and put together in files that stay on your space.
this is an example of a post on the site. You can see all the work he has done since joining the site and his work is fantastic. No doubt one of the best on there. There is this and many more amazing artists who use this site.