Gravatar image not updating
Now when you visit Settings Discussions you can find the new Gravatar image among the other choices.Select your custom Gravatar for default Gravatar and save the changes. Here are few more additional Gravatar customization features for developers that you can use.Once registered with Gravatar, all your profile information along with Gravatar image is saved with your email address.Word Press has built in automatic support for Gravatar and automatically displays avatar next to username when someone write posts or leave comments.
You can manually update your avatar by uploading a picture from your computer, connecting to Disqus through Facebook or Twitter, or by selecting an existing Gravatar.
If you have granted any 3rd party apps access to your Disqus account, they will appear in your Apps settings and can be revoked if needed.
If you are a moderator on a Disqus forum, you can configure your email notifications for each forum in your Moderation settings.
By default Word Press uses the Gravatar called Mystery Man.
Here is a look at Word Press comment with default Gravatar.