With the first one, as cels mentioned, her gaze doesn't look like it's fixated at the blonde, I feel like the over-usage of black might be the cause of this problem.
With the second one there are quite a bit of problems; mainly with the proportions and to a lesser degree with the anatomy itself.
First, the torso, it looks too long in comparison to the length of the legs and arms, so I shortened it (moved the pelvis up higher).
This actually fixed another problem in the process, by moving the pelvis up, I also moved the thighs up; resulting in them becoming longer. Beforehand they were too short in comparison to the length of the lower leg (the upper limb, in both the arm and leg, is noticeably longer than the lower limb, especially in the leg).
A bit more on the legs and pose in general. No offence, but it's a rather weird pose, with the pelvis being pulled that far forward, and the back bent pretty far backwards; I got a bit of contrapposto feel out this, mainly because of the hips' position, which would imply that the leg that is holding this figure up is the rear one, and the front one is the relaxed leg. So I went with that.
The second (or third) proportional problem here is the neck, I think I could have even went a pixel or two more in my own edit; but it should be slightly longer than what you've made it.
Now in the beginning of the post I mentioned the anatomy, but said it matters to a lesser extent than the proportions; reason being (the possibility) that you're not going with a realistic style so I don't want to press to much on that and delve into explanations (the main anatomical problems right now, regardless of style, are the arms and lower legs); despite this, I have marked some main muscle and bone lines in the edit (I made her look emaciated on purpose, to better emphasis on the bones and muscle groups. I don't expect you to follow suit with that kind of look

), so feel free to ask me why I did something like I did, if you want.

edit*
oops, didn't notice that you said the second one is something you're going to work on after the first; kind of got the impression it's a double project or something, my bad. Hopefully though it can still come in handy later on.