Hmm... consider the style of face you're using, I would suggest shortening the torso a bit. Maybe by half a head or so. This will help give it that "young" much more silly goose look.
Fssssshhsepdpnhjedohahhh!! I was going yo tell him to make torsos longer. D:!!
SO. taking both Jason and I's crits in mind, my best suggestion to you would be to experiment to find out which you like better. :3
Your knowledge of anatomy is there, its just its not polish enough? The shape and curves are there, but they are not scaled properly, or does not scale to fit properly...There's one thing that I've come to realize is that, the anatomy doesn't have to be spot on. It just have to be scale to fit into the appropriate anatomy. And by that I meant the style you're trying to achieve.
Iccy's right; if you fudge anatomy, usually people can't tell if it's done consistently, done well, and done proportionately. It seems to me like you know a lot about anatomy (especially compared to when you first started, holy crap--why am I not improving like the rest of you people?!), but something about the bodies still seems "off". After evaluating for a bit, I realized that maybe your necks could be a little longer (stylistically) and you need to work on posture.
Now I know you're thinking I'm insane right now, haha. You might want to flip the image horizontally to see what I mean. A lot of your drawings have people with bad posture in them. The characters hunch over a little bit, which, in effect, makes the anatomy look more off than it actually is. Just try to work on that! :D I had a big problem with it for years; my characters would stand like I do, and I have a really weird gait and posture (so I've been told by many).
Try playing around a bit. Don't put to much details, just try drawing small, simple sketches to capture the proper anatomical proportions of the general body masses.
If you want specifications, here is what I'll say,
-Neck needs to be thinner, not too much! But just a tad thinner, and longer. Agreed
-For the female body, try to increase the size of the hips, and shorten the torso to 3 1/2 heads rather then 4. Disagreed, but discussed.
-Trying push the chest out and up a bit. Really push out the arc of the back bone. Posture; agreed.
Oh, I also checked out your DA page, and man. You are a little improvement monster! D: JEALOUSSS.