FSTS: Looking at proportions - Adult Female opinions?

It seems as if I needed to get my head out of copy world and try and crack down and do this stuff out of my own mindset not someone else's. I ventured back to my deviant artist group and got in touch with a few of them and they gave me some resources to look at, mainly some tutorials on how to get the shape of a female down. I managed to get the three of these but I am unsure if they look proportionate? Of if they are okay? They seemed to have gained an extra head height but that's how the tutorial said to draw it.