Here are a couple of options:
Creator:
Since his profile mentions rules and he is the originator, the clue points to him: Goddess of Justice - Themis

I tell the artist to depict Themis, and he decides in what form and so on, but this is an easy clue. Here's a more interesting option:
Lu41k
Lu41k's profile lists his activity as medicine, so as a hint, we take the flag of Tonga:

We ask the artist to depict the flag, or another option: just a cross, and from there you can draw the flag of Greece, Iceland, Switzerland, and then a regular cross, etc.
