Adding a small image to your profile, called an avatar, helps establish your identity on the board.
Mine to the left is this painting by Alex Grey, called "Collective Vision"
Since an avatar is square shaped, this got compressed a bit vertically. But you get the gist of it.
It's really easy to add one. Just click the "My Profile" tab above and under the "Personal Info" section, click "MY AVATAR". From here, you can select one of the available Avatars, or upload your own image.
Unsure about your choice of avatar? You can always change it later on.
So that's it! Simple as pie.