Hey there! Cute pictures. I don't have a lot of time, but here are a few things I notice right away:
First Picture: The feet are at pretty odd angles and it looks as if the legs are different lengths. According to the length of the body, the arms are much too long. The eyes are lop-sided. The shading of the hair (particularly the curls) don't make sense; the insides of the curls should be darker than the outside.
Second Picture: The eyes are different shapes. The top of the head doesn't look quite right, but the camera cuts it off. Her bangs are blown to the right, but the hair in the back is hanging straight down.
Third Picture: Her waist should curve smoother, not be pointed angles. The side breast line goes to far into her shoulder.
Fourth Picture: The head isn't connected to the neck quite right (it's too far to the left). The arm on the left is a bit too short.