You can always paint a claw-foot tub to make it look superb! My dad did his black on the outside - it totally changed the look of the bathroom. I'd like to see a bit more black and white in this room to make the pink really pop.
If you are more interested in creating a true vintage look for the bathroom then you'll want to pay attention to two things. First, choose a tub that has a great vintage color - pink and green are good choices or else you could go with an antique metal tub. And second, choose accessories (like the radio here) that add to the vintage tone of the room.
Imagine if this bathtub were bright red instead of this pale pink color. Wouldn't it make you want to luxuriate in the bath all day long? You'd feel like a pinup model! I think red would've been a far better route to go here and I think it can really work in a bathroom that's got unique pieces in it like a clawfoot tub.
In a different imagining of the feminine bathroom, this space embraces the girl - a pink tub! - but it's minimal and straightforward design doesn't say "no boys allowed." It's the kind of femininity that anyone can be comfortable in.