It’s very easy to create a “gravatar” (Globally Recognized Avatar) for yourself that represents you pictorially when you post or comment on wordpress (or many other places).  Go to the gravatar site and then take a picture using your computer’s camera, choose an existing picture, or choose any avatar image you like to represent yourself.  Extra bonus: it makes it easier for me and for peers to put a face to the comment, especially in the early part of the term when we’re still learning names.