Uh... since I'm here, might as well as posting some of my new drawings and ask for some criticism.
Loooooooong arms are long. >.>;;
Eh, I think there is something off with her face?
lolhands... no, scratch that, loleverything. >_>;;
lolshoulders, lolarms, lolhands
Yeeeah.... fire away
Ok. You're asking for a semi-serious critique, since you're kinda serious about getting better as an artist. So I'll give you a honest, serious critique, since I think that you are beyond the need to be flattered phase.
You're not doing your underdrawings, and making a half-decent underdrawing would fix your face in perspective. Another thing that would fix that face, is a center line. Drawing in where the line of symmetry would be in a piece like the thirds one.
Reason why I'm talking about that first is because there is no dimension in all four sketches. What that usually means is that you aren't using basic 3d shapes to define your base, before you apply all the detailed information. Secondly, you have floating features galore. The casual watcher can tell that from looking at it, that all the features lack grounding, from the facial features, to the length of the arms. Everything lacks grounding and proportions.
I'm not going to go into detail on everything that is wrong, because first of all, it will overwhelm you, secondly, almost everything that is wrong, is linked to you not doing a proper underdrawing. I can see it here. You're trying to do so much in your drawings, but you're getting lost on where things are, and how they work on the figure. I'm ignoring the anatomy right now, and there are many, many anatomical flaws, but right now, your biggest issue is making a decent base, and not drawing on the fly.
Once you nail that issue, I can nearly guarantee a 50% improvement on all your drawings. Even though the proportions will still be fucked up, your drawings will have mass, have dimension a hint of perspective, which, with your level of line work, will take you very very far.
Your secondary issue is obviously anatomy, and knowing how long to make your blocks. But your first hurdle is to start making those blocks, so that you can pin your higher details on those blocks.