In general, Constantine, rights may be complications with the tax.
From the tax payments are exempt nonprofit organizations, and ArtInvestment - a business that is for tax service it will look like first collect money, and then list them on blagotovritelnost, in this case, the money for the painting, from the sale initially considered as business income Artinvestmenta, although the ideas they were originally for blagovtoritelnosti, and then, will still pay taxes ...
Ie I think in this case, better to get detailed information on the organizational details in terms of legal and tax someone who organized a charity auction in Russia where it is not important in real or online, the money is ultimately still come to the bank account .
And I'm not sure that the tax will quickly and correctly answer, in general, becomes difficult.
It is better to advance to these events and ArtInvestment as its organizer was as if a license or permit to conduct a formal, something like that.
Here
here information for a charity auction in support of NSF