Here's an example of a portfolio I love. This is Jen Mussari's portfolio website, she's a lettering artist in New York. She uses Squarespace to host her website.
While it would be nice to see some in depth case studies of her work such as the process from sketch to finish, showing a wall of her work like this on her homepage is a great way to immediately get what she's all about and the type of work she does.
If you'd like browse through her amazing lettering portfolio this is her website: http://jenmussari.com