Quote from Charryand if you're going to have the chest showing, draw in a cleavage to prove the breasts exist, because just drawing their shape through clothes looks like she has a giant 2-D circle shape in her chest. Also, it looks as if you've only drawn in one large breast. They should be higher up, and you should draw them generally like two teardrop shapes, not a single circle.
The worst example is this one:
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[/spoiler]There is literally no indication of anything around the chest, and it's even more of a sore thumb when you've drawn shading elsewhere. In a front view drawing, your best indication of breasts (especially when they're covered like how you've done) is with shading, which can be simply done with either shading of the cleavage or underboob, so don't be afraid to try it. I'm not saying every character you draw needs to have Eiken boobs, but you should still come to terms with it, since you haven't really tried with any of these.
Another thing is to start drawing ears. I'm relatively busy with a lot of things, so I don't have time to critique everything, but I'll get into everything else when I have the time.
