I like how you draw faces. How long have you been drawing? It seems like your style is developing nicely, but the proportions seems to be an area you could improve upon.
For example, in your first drawing, you did notice a few of your own problem spots. I also wanna suggest, the tail is a bit off center, but I also think it should be lower. Like.. right above the booty. Also, this might be a bit of a pet-peeve of mine personally, but the boobs are way too bit for a woman that skinny (although that might be what you were going for.. haha. If so, I apologize!).
Also, the proportions of 2 and 3 could be tweaked. The arms look kinda short, and the torsos don't look quite right. You were drawing curvy ladies, right? A website like www.posemaniacs.com might help with poses and getting the female anatomy a bit more realistic.
Hope this comment helped. Good work!