How do I...How do I upload an avatar to my User Profile?
Answer

Your profile picture is used as the icon for your personal space, to represent you in the People Directory, and to illustrate your comments. It also appears in various other places next to your name, such as in the list of recent updates on the dashboard.

You can upload your own profile picture or use one of the images provided by Confluence. If you upload your own profile picture, you will have an opportunity to crop (trim) the picture if its dimensions are larger than 48x48 pixels.

More information is available on the Atlassian web site's Choosing a Profile Picture article.