I'm almost certain that's a ringlight. It does show really oddly in the first two. The camera is further back in 3 so it isn't as noticeable.
What I don't like about the first two is the short focal length lens. It makes their heads look disproportionately large and their noses bulbous... Not flattering on two very pretty girls. Also, in both, the texture of the wall behind them is distracting. You have a ring flash so having them stand further off the wall wouldn't have caused any distracting shadows. That plus a larger aperture would have blurred out the texture of the walls, but left the color.
About the bras... that's very common for that age group, unfortunately, and it's only in the context of us older-farts that it's "trashy".
The third is fantastic. I hope that it's not PhotoChopped and that instead you pulled this off with a rear-curtain sync, small aperture, and a long exposure!