For Chrome: Menu > Tools > JavaScript console > Copy paste/hit enter the following:
character.src = 'http://i.imgur.com/iDKBdS5.png';
For Firefox: Tools > Web Developer > Web Console > Copy paste/hit enter the following:
character.src = 'http://i.imgur.com/iDKBdS5.png';
Want to load it as a mod?
Copy paste the following into a blank file:
character.src = 'http://i.imgur.com/iDKBdS5.png';
Save the file as character.js (or whatever you want it named as), and load it through the mod loading option in the Wayward options.