As far as I know (im no expert!) a touch up should be able to repair any accidental damage thats occurred to a tattoo while its healing, and im pretty sure most artists will offer a free touch up for any tattoo that they do!

Hi,
Glad you like the blossom idea. When you’re searching google, are you just looking at actual tattoos? I’ve found more inspiration looking at artwork and pictures as well. Also have you had considered maybe combining some of the more modern japanese styles of art/design

These are a few different pics showing the different styles Ive been looking at. If you want a few more PM with your email address and Ill send you more of what Ive found.

Hi
Im currently trying to come up with a plan for a japanese themed sleeve myself.

What about a google image search for japanese history and see what comes up, there’s a lot traditional art which contains some really cool stuff which you dont often see in tattoos. Or what about using the blossoms to form shapes/images?

Just a couple of ideas!
Good luck, hopefully in a few months we can compare finished arms!