By placing your work in the spotlight, you learn about its value for others in ways you might not expect yourself.
Organize an exhibition, a portfolio site, a conference, or another way to exhibit your work to a wide range of potential experts. Make sure you collect lots of feedback, for example by organizing a contact moment with the experts for follow up.
Exhibition as a method is practiced a lot in art and science; several conferences with a professional orientation exist such as UX-camp and The Web and Beyond Conference. An exposition of your showcase projects can be important for marketing but also for finding out opinions and unexpected new uses for the portfolio.