How to set up your avatar in SourceTree.app?

1. Go to http://en.gravatar.com/ create your account and upload the avatar image files that map to your emails.
2. Close Source Tree
3. Delete the cache file (or delete all files) inside path

%USERPROFILE%\AppData\Local\Atlassian\SourceTree\cache\img

e.g. C:\Users\MYUSERNAME\AppData\Local\Atlassian\SourceTree\cache\img

4. Open Source Tree. Now you got what you want!