Good for you! Charity auctions built my portrait career, and now you're off to a good start, too.
I would also caution you in your pricing, however.
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If they want an additional person, I will add 50% to what they paid, plus a fee for a larger canvas if necessary.
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"What they paid" could turn out to be very little indeed, when compared to whatever you had set as the "retail value" of your item. The winning bidder could get themselves a terrific deal and actually only pay a fraction of your "retail value" at the auction. It all depends on how the auction committee set up the minimum bid, and how many bidders there were.
It would be much more effective to base the price of any second person on some percentage of your regular rate, not on a percentage of what they paid at the auction.
And I also second Chris's opinion: putting two or more people on a canvas increases the complexity immensely!