Yes, it is just pixel art until it is implemented into the game. As long as the head is made from scratch (which It will be because only approved artists will be able to sell from what I hear) since you are legally able to purchase art it breaks no rules. In the long run it is good for Graal as it creates more business for graal by uploads.

As an artist and a player I think this is a great idea, as it will provide original content and a way for players to safety aquire it. The idea is already in practice with artist providing work for players but this garuntees players will receive their content.