Well, I think there's a couple issues beyond upsetting who you drew for in the first place:
1. Plagiarism issues - what if your art inspires a similar scene or story?
2. People might not like being offered art that was already attached to a story - they might not bother choosing it.
I won't disallow it, because, really, I'd never know if an art was attached to another story unless I'd read the story and seen it in the first place. But I don't suggest it, either.
You have plenty of fics! Remember, you don't *have* to put in three on anything. One or two is fine, too!