Overall I like these, but there are some things I think in each one which could be improved. Please take these as constructive criticism, things to keep in mind for future shoots.
1) The Stairway to Heaven
I like the processing here, I think it fits the scene very well. I like the over-the-shoulder glance and the hair covering one eye. Where I would tweak her pose is in the foot up on the stairs. Partly because that foot is resting solidly on the stair - toe and heel - her entire pose seems a bit stiff. If that foot had been up one stair higher, and only contacting the sole of the shoe (heel in the air), the pose would appear more dynamic and put some more definition in her calf. You may also have been able to move that foot slightly so that it wasn't being cut by the railing. I'd also look to remove the mirror (artwork?) from the wall, either by actually taking it down, cloning it out, or reframing the shot. I'm not saying it draws the eye, but once you glance at it there is enough going on that it sucks you in. And where the crop cuts through it makes it seem incidental (which it probably was) - if it doesn't add to the shot, might as well remove it.
2) The Colorful Boudoir Shot
I love the colors in this image. The bra and panties, the shoes, and the pillows work very well with the neutral sofa and wall. Unfortunately I think the pose here is a fail. I don't know if this is the final crop you provided to her or if you cropped to remove her face for posting on here, but as shown here the crop across her face diminishes her as a person. If you're going for an air of mystery, I'd shoot her looking to the side or away from the camera (include what seems to be fabulous hair) rather than capturing her looking back at the camera and then disregarding (cropping) that engagement. Even if the full image includes her face, I think you missed a couple opportunities with her shoes (you're getting more of the dirty bottoms of her soles than the wonderful bright orange) and, frankly, her breasts (by letting her right arm cover her curves).
3) The Soft BDSM Shot
There are only two things that bug me about this shot. I'd suggest, if you revisit this, to remove the sofa. It's presence actually led me to think she was sitting on it at first - it took me a minute to figure out why you even titled this a BDSM image. The sofa is also too convenient a surface for her snack plate, and that ends up being partially blocked rather than coming across as an intentional element. Lose the sofa, bring in a small side table, and I think you have a tighter image. The second thing (also true in the colorful boudoir shot) is that it is annoyingly just a touch off center. You have some elements (the bed, the art on the wall) which would create a nice symmetrical layout if centered. Alternatively you could go more off-axis with these elements. But as is (and maybe it's my own OCD), I get a feeling of "oh, so close!"
There is a lot I like about these images - they look sharp, the lighting looks good, I like the concepts - these are just some nitpicks in the execution which I feel could have made them a touch stronger.