^ then I'd say first of all check all the works the tattoo guy has done before
You have to be absolutely sure he knows what he's doing.
And like xLuna&1LOVE said, maybe tour or albums logos are not the ones for you but something that is inspired by yourself or your connection to her music? That can go either through lyrics or new symbols that are connected to the "A". Tattoo guys (I don't know their real name in English
) are normally pretty creative people, too, maybe yours can help to come up with something.
For example a very nice friend I met at ayu's concert got a wonderful tattoo that incorporated the "A" in it. So it was personal, but with the "A". Very creative and personal, but still kind of a "fan" tattoo.