I think we probably just have different perspectives on life, which is totally fine. Personally, I don't see how a tattoo makes you any less presentable of a person, but that being said, I'm not naive enough to think that a tattoo won't hurt your chances of getting a job. I'm pretty sure, however, that girls with full sleeve tattoos aren't pursuing jobs in accounting.
As far as a formal setting goes, I think that a beautiful girl would have no problem looking elegant in formal attire. I was recently at my cousin's wedding and he married a girl with a full sleeve tat and she looked absolutely stunning in her wedding dress. Life is all about perception, with literally everything. If you think someone does not look presentable because of tattoos, then they aren't. But if you think they are presentable, then they are. What's the difference if the person has ink on their body? None. Would they be any more or less productive in whatever they're trying to do with/without a tattoo? No.