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1. Pretend the tits are liquid in balloons; elastic but weighted. Yours are stiff and hold their shape in clothes. Remember; it's the same stuff as your lovehandles, but an entire watermelon of it.
2. Big hips, tiny waist. The proportions up to the boobs look good but the head shoulders and arms look small. Don't be afraid to make wide shoulders, you're drawing humans. And big heads on this kind of drawing should be a given.
3. Keep loose. To me, it seems like a robot drew these. This can be good for staying on-model during animation, but it's very bad for an illustrator. The problems I mentioned previously stay exactly the same through all the images, which makes me assume you've got a protocol to draw by or something. Are you using an art book? Get rid of it now. You've gotten good enough that it's time to start getting elastic. But being TOO loose like me can be bad. I draw cartoonish stuff all day and people laugh at it, but if someone tells me to try to draw something again, I find that I can't draw something twice. Someone with your discipline and my elasticity would be a top-notch illustrator; be that guy. Fly free and find your style.
Your drawings are good. You have potential. Don't stop drawing and don't ask for advice on 4chan; the worst thing you can do is get unconstructive criticism from the idiots here.