[fl0w][Alpha][Catalyst][Submerge][Calamity][Swosh][Scourge][Colors][Neko][Miner][Kunt][deprav][Possesed][TMO-Leader][Proud Council member of TeamLenshu]
To watermark the head, open it in an editing program and put some sort of mark on it like your name, and then save it as a different file. Then people can still try it on, and if they buy it, you sell them the un watermarked version.