To put a head texture on your tori.

Buy 128x128 head texture go to "shop" "texture" "choose your image" and "upload"

IKoorie is correct, but creating your first head can be frustrating. Be sure to follow the head
texture template
But hey, be aware of plagiarism! It can get you banned pretty quickly

You can also go here to download/save a free head texture: http://forum.toribash.com/showthread.php?t=565971

If you are caught trying to sell a free texture you will be punished though.