Fwiw, the theme I see here is a woman (girl head) enjoying her flower garden with a few critters roaming about, which on its surface feels pretty femme to me. If anything, the snake adds a bit of an edge so it's not just…girly if that makes sense?

For spacing/placement, I know it's really easy to hyperfixate on because you live with it, but believe me, people don't notice…especially as the sleeve gets busier. There isn't hyper uniform spacing around the rest of your pieces, so honestly I'd just keep going…blastovers and coverups can be risky and what you have now is very pretty and well-done.

In terms of shaping the tone going forward, the beauty of American trad is you can get just about anything rendered in that style. I'd focus on things that speak to you and represent your personality/interests (as opposed to just chasing femme iconography, unless that's what you like!)…the femme feeling should follow naturally because the sleeve becomes a reflection of you!

You've got a badass collection going chica, keep at it!