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If you obtained permission, it'd be fine. I've been curious for a while what the legal situation is exactly regarding sale of fan artwork. Many comic book artists sell commissions of copyrighted/trademarked characters in their spare time, and don't seem to have any problems doing so.
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The general rule of thumb is if the owner of the IP isn't a big name company you go out of your way to get permission, otherwise it's not a top priority thing because most big name companies don't care unless the work is being mass produced. In that instance, expect a cease and desist.
A lot of big name companies see fan work (sold or not) as promotional work, even though according to the law (US law, at least) all forms of fan art are copy right infringement.