I'm a super novice at anatomy, but I do know proportions so I'll comment on that.
For female characters, the shoulder span should be almost identical to the width of the hips, with the shoulders just being a bit wider. For really... bodacious characters, the hips are wider than the shoulders.
Your arms are off in terms of lengths. Generally, the elbow ends at slightly below the middle of the torso, the wrist near the end of the torso/crotch line, and the hand somewhere between a quarter in to the middle of the thigh.
While this isn't 100% correct as it varies with style (especially deformed/chibi styles) and a character's height, a good guide line is that the legs are the same length of the upper body, from crotch to the top of the head.
I don't know if this was intended, but the massive head gives the character a very childlike appearance.
I hope that was helpful-ish