Hey
How long has it been growing on you? You don’t sound totally sure about what you want – and to get a full sleeve when you’re still moving between styles seems risky.
Why don’t you try getting a few japanese style tattoos and then see if you want to extend them into a sleeve?
The idea itself sounds fine though! Check about plants – some plants in Japan are different seasons and you shouldnt include them in the same tattoo (I know nothing about it but it’s something to check in research)
Poesy