Okay, I'll try and give some critique. (Please note I'm not an expert on humans)
First picture, her face looks a little long. Her torso is also a bit bulky and big compared to the rest of her body. The waist I find a bit long, it should probably end where her shirt ends. You could lower her shoulders a bit, and give her more of a neck. Her legs could be longer in comparison to the rest of the body.
Second picture, once again, long torso and short legs. From the back, women usually have a curve around the waist that could be more defined, rather than just being straight. Her shoulders could be lowered and head raised, in order to have more of a neck.
Third picture, I notice the face being a little too long, even if she has a long face. The nose could be lowered to closer to the mouth than the eyes. She has little neck again. Her shoulders could be wider in comparison to the face which appears too large. She could have more of a forehead.
I haven't given much crit before. I hope you don't find it too harsh, these are just little corrections. Anyway, I hope you find it helpful. ;3 The most major thing I can see is that the face is too long and the legs too short.