Nice work. I like your blue Jessica, and Ginger, and your David & Susan shot. I like the pose and exposure of the David and Tierra shot, but the models "feel" lost in the center of the image, amidst the steps. I'd crop it just above the male's head, but even then I'm not so sure - partially, the two are not interacting; they're looking away from one another, using each other as a prop. .... Ummmh. Don't know what to say.
The last is also well exposed, and I like the composition, the shadows, and the beautiful woman - but I don't think this pose is particularly flattering for this model. It takes very thin, very toned legs to do that without looking heavy. G*d knows I've done that enough.
They're good stuff, Dave. IMO, quite a new area for you, and very nicely done. Thanks for sharing.
"Keeping shooting will do more for the excellence of your photography than most any camera will!" JimmyD, PGS Extraordinaire.