Think of it as a fluid document. Like your traditional resume, keep LinkedIn current. Feel free to list details about the projects you've worked on. Additionally, don't shy away from including a headshot as well as a short summary about your talents and aspirations.
Be conversational. Don't be overly professional. People want to see that you have a personality.
Showcase what you've done. LinkedIn allows you to house projects and links that you've worked on. Share your material with your network and spark a dialogue.