I don't know what this temporary tattoo is outside of a stick on tattoo but small detailed tattoos and small script tattoos run the risk of bleeding together eventually into a muddy mess that's unrecognizable.
I also suggest bigger is better but some people want what they want. I'd never do script at such a small size that it would run such a risk though. All the e, o, a, and whatnot close up within months if too small.