>>1619767Couple issues. Like you said, thickness is all over the place, especially for the hair. Most of the outer edges of the air is thicker than the inner. Either choose to thin out the parts farther out, or make the hair farther in fatter.
The endpoint for the ribbon to the left of the face looks really weird. You may have an extra node there you want to delete.
The biggest issue you have is the face. The lines for the eye are incomplete and waaaaay too thin. With that, the white for the eyes are a little wonky and lopsided (and need shadows). Also, the pupils are too tame for this image. You can see they aren't normal pupils in the image and are more crescent moon shaped, which give a more fierce look. If you don't like that look, then you just need shrink the width of the pupils in your image so the pupils don't look so tame.
That leads into the mouth. Again, the way you have it drawn, it looks like she is tame, but in the original it is far from it. She has more of a grin look. It also needs some shadow, even though you can't see it. The nose could be a little bigger and thicker too. Chin needs to be pointier as well.
Lastly, the shadows for the face need to follow the shape of the hair, so just look at both the shadow and hair and have it follow the curve.
Since it was a lot to explain, I did the face to show you what I mean. Don't pay much attention to the thickness of the hair. It is merely there so the coloring doesn't look as weird.