Tattoo touch up

Hello, I don’t know much about tattoos etc but my husbands birthday is coming up, we’re getting older so instead of a material thing I’d like to maybe get an old tattoo he has kind of “livened up” ? It’s just a black outline of a dragon he got about 15 ish years ago and would like to see about getting some color or detail added? Is this a speciality thing? If so are there any shops in the area Anyone can recommend? Located in the Melbourne area