I like your first set's model much more than the woman in the second set. In the first set, I thought the soft focus technique you used did not compliment the model's hair, and in one of the photos, her teeth look somewhat yellow in color. The color shift is something I have noticed happens a lot when a Gaussian Blur overlay is used, and then the Multiply filter (or other types) is used on that blurred layer. However the soft focus effect was applied in post-processing, it just wasn't the best technique for the conditions in that set.
The model in the first set, even though she's just a friend if yours, has a lot of eye appeal,and that makes it easier to get pleasing results. The physical attributes of the woman in the second set were not so camera-favorable,and in the color shot of the blonde, the yellow skin tone was very distressing...just awful, to me at least. Anyway, I think AnneRiceBowl's suggestion to watch out for "muffin tops" and other small details in clothing and subject is really good advice. I think moving the camera's position a slight bit can also be a valuable trick. LIke on the shot of the woman lying on the bench and facing the camera outdoors; if the camera had been moved a little bit to the left, or one of her feet raised up in the air, we'd see her body in a different position. It's almost a cliche pose now, buy lying down, feet up in the air, ankles crossed---the out of focus feet and calves in the back give an almost subconscious feeling of 'presence' of the entire person in the photograph. But when the buttons and lower legs, or the feet are not shown, what the viewer sees is only the frontal planes of the scene, with the face,shoulders,hair,arms....the person as person is not shown. What I'm trying to say is moving the camera's position, up down, left, or right, a little bit, can often make the final photo look vastly different, so that's something to be aware of when building a pose and framing it. You need to ask yourself 1- Is the pose solid and complete and natural? and 2-AM I framing it the right way? I.E.--horizontal or vertical? Camera too high or too low?
Anyway...just my thoughts.