Good job! Nice compromise between reality and manga. The problem, in my opinion, is the hat because it's too flat and the lights on it are wrong .As you can clearly see on the hand or observing the reflections on the dress the main source of light comes is on the right, even if it's clearly a diffused light probably because the sky in the source image seems cloudy. I suggest you to use another source image for the hat, or, if you prefer to mantain that, change the lights on it and apply a material texture. Good luck

Nice work, you transformed a good idea in an even better result. Good luck