Not my favorite pose but that is just me. Otherwise, not too bad for a first try.
#1 You lost her chin in her neck. There is basically no tone difference and it looks weird. There's also something going on with her left hand, almost like she has a ghost finger. And last the earring, which I didn't realize was an earring until #3, is annoying.
#2 Whatever that darker thing is by her right hand pulls the eye there and forces you to look at the flesh colored part going from there to the frame of the image. I don't know what that is either but it is of a similar tone as her skin except that it makes no sense being part of her body... Something just doesn't jive in my brain.
#3 Because of the stuff mentioned above this is the best one of the set.
Details are very important. They can make or kill an image and you need to pay attention to them. Practice, practice, practice and you will learn.