Trust / honesty
You'll probably have a few people take advantage of you if you offer that type of guarantee, but most customers online are fairly honest. Obviously, every online business has to deal with some amount of fraud, but I know that if my name ended up looking like one of those balloons from a circus clown, I'd want my money back. But, for the most part, your increased sales should offset the number of people wanting their money back.
Is it something that you could generate a preview (small, with a watermark) before they buy and then give them a full-resolution image once they pay? That's all I'd need to see... gimme a thumbnail and all of my concerns are answered, so long as that thumbnail is really my name and not just a generic one.
Just my $.02
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