As for the second, the hair looks good, but a little bit too close to the skull if ya know what I mean, maybe make it a little bit more 'free'? The glasses look good too, but if you want to make it seem thicker, you could use a line to suggest the edge/corner of it; it doesn't have to be thick either, just a small line indicating that the glasses are thickly framed

The left eye is slightly smaller in contrast to the right, you've got the perspective about right, but the farthest eye from the viewer should be skinnier than the one closest to us, but just about as tall. The ear seems like it's missing the lobe and ear canal, but it looks fine with or without that, so neh~ The neck looks a little on the short side, might I suggest using more fluid/curvier lines? The left shoulder looks good, but the right (once again, I mean our right) seems a little small and is missing the collar bone area (Trapezius muscle) and the arm looks too thin/not muscular enough (even girls have a little muscle :P) The breasts look about right, maybe moving the right slightly a little more so. I love how you drew the curve from the ribs though! It looks nice and the nose looks cute ^u^ Something that may help is by looking at your drawing in a mirror, I hear it's easier to spot mistakes :-)
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