Strategically, do not vote for for Orchid, Cactace and Camelia. JP player have voted for them and we will receive them eventually as Tenhou point out.
I also recommend not voting for any 6*, since the first choice will be raised to 6*, with a new art.

For me, I will vote for 4* and lower girls.

4*: Cepha Lanthera, Hinoki Cypress
3*: Blue lotus, Serrata Rosalba, Alstroe Maria, Gomphrena Globosa, Jasmine, Rosa Novalis
2*: Scarlet Salvia, Bistorta

I will probably vote for 2* - Bianca Clover. And then wait for the mid-vote or something.

Developer should have made 4* star below popularity contest. That way low rarity character will have a chance.

At least we are getting the event at all and the DMM team makes Bride Version for our Top 3. Or somebody decides to vote for a character that already has won in the DMM Contest, rendering that useless.

You can either get 3 new characters or 6. So please stop voting for Orchid, Cactace and Camellia.