Your picture is the image that is associated with your account, shortlinks, and public profile. We try to automatically set your picture based on your linked Twitter and Facebook accounts.
Head to 'settings' located in the top right corner drop down menu while signed in. Under the ‘Connected Accounts’ tab, you can add a Twitter handle or Facebook profile.
Or if you have a Gravatar account- connect it to the email address associated with your account, and we’ll use it. You can change your photo anytime!