I suggest making the line a bit longer, and to split where the breasts go off from each other, otherwise it looks like her breasts are glued together like they do here. Also, pay attention to line quality, because there's no shading or difference in your lines for that matter. which is why the picture looks flat. nice job on the chin and hair. last thing , try to focus on depth perception as well. I know drawing women is hard, since they're softer, and curvier, but you'll get used to it.