The Santa Claus bust is created by our digital sculptor Kyriakos Georgiadis. It is an original creation for celebrating Christmas 2015.
The model was sculpted and painted in ZBrush from scratch. It was then printed in white PLA with no supports. Have a look at the printed model:
You can find the 3d model, both in full color for Multicolor powder print and no color version, here and here.