No, you can't fix bad line work. All you can do is make sure you don't make the same mistake twice.
I wouldn't worry about that tattoo. I've seen many, many more that are far worse. Just look at it at a high level, don't look at every detail. I say this at least once a week - you start fooling with a tattoo like that, you're far more likely to make it worse than to make it better.