kirbinster makes a good point.
The only way I see this working without you seeming like a creep is with a sophisticated ticketing system.
But I am not aware of any web-script or module that would allow you to do this on your own website. That may be a long and hard google search.
When I first read your post I thought, "Yeah ok. You can hand them a card with your URL and walk on". But without a reference of the picture number you would get a lot of grief from people saying "I don't want other people seeing this" or "How do I make sure I'M the only person who can buy this?". So you would have to gear your website to have a unique reference number (as this would allow you to fall back on this and say "Only someone with that unique reference can see this picture").
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