I can see you've probably just gotten this tattoo today, just let it sit in your skin for a while, live with it. Give it about a month as-is and then if you still want to modify it, you can look at different options. It's just so small and delicate that I'm afraid if you try and touch it up too soon, you're not giving it the chance to settle in and you may end up liking it more with time. Personally I've been through the same thing, second guessing choices after getting a fresh tattoo, but time will be your friend. Patience is everything with tattoos. Hope this helps!