IMO, your tities are adorable and fit your overall body aesthetics very well. If you go with implants, you will also get quite ugly scars. For me, the only improvement that needs to be made is getting rid of your nipples piercing (completely!). Every time I try to suck on them, I get a mouthful of metal instead of you.
If I could make a bet that your final decision will not be based on terbies opinion, i would
. Anyway, everything is good in moderation. I think the art you have right now on your body is enough. You have great skin (except when you break out), so covering it in more paint, is like replacing the Ferrari car body work with a Toyota one: it is still great underneath, but it's now almost impossible to tell so.