Collector of digital art (originals), must include Assignment/Transfer of Copyright Ownership, legally binding agreement.
Characters not original to the artist ("fan art") bought only with written agreement keeping the work private (not for public distribution).
I currently own three characters, the likeness, all rights thereof, period. All are registered with United States Library of Congress. For reasons of privacy, they are not shown here. Simply put, I do not want my property floating around Internet. Creation of derivative works, forbidden.
I have no artistic talent of my own, save for that of admiration. I find beautiful that which is brought to life from the imagination, the substance of dreams.