Question: how to change your head in minecraft?
Answer: Step 1: Command Block. first type in this command /give <your username> minecraft:command_block. ... 
Step 2: Command. Now in the command block interface type the command: /give @p minecraft:skull 1 3 {SkullOwner:<username>} ... 
Step 3: Power. add some form of power preferably something toggleable like a button. ... 
Step 4: Enjoy!