I agree about the face. No.1's eyes are too close together. Rule of thumb: eyes are usually spaced so that the distance between them is equivalent to the width of one eye.
Other than that, I would just continue to study the anatomy. 3nodding
Although your drawings are nice, I think you need to study some anatomy to improve. :] I don't know if you use guide lines, but I think they would help you figure out where to put what. Other than that, I think your drawings are improving. I like the coloring on the third one. ;D