It is, of course, free for use. But please make sure you follow the rules!
Rules of use ♥ Please ♥ Please credit me!
How to use ♥ Click "download" ♥ When it appears in a new window, right click and click "Save As" ♥ Save avatar to a place like your desktop ♥ Go to your deviantART account settings ♥ At the top of the page by your current avatar, click "Change your avatar" and click "Upload avtar" ♥ Go to wherever you saved the avatar, select the file, and click "save". ♥ Enjoy your new tea avatar!