Your weapons and equipment look good overall.
A couple of things I would recommend is to replace the Bees Knees with a more powerful bow or Repeater, such as the Ice Bow, Shadowflame Bow, or Adamantite Repeater. And then tinker your Hermes boots into Spectre boots.
If you have a band of regeneration, I'd recommend tinkering it with either a Philosopher's stone or the Band of Mana Regeneration you have. And then I would replace your Shackle with a Star Veil, gotten from tinkering a Star Cloak and Cross Necklace together.
Arena and potions seem good to go. With those recommendations in place, you should be in good shape for the Twins.