When you want to do smooth lineart best thing is to use the airbrush on med flow/opacity, applied in thick lines, then shaved down with the erasure on med/low opacity/flow. It's soft, clean and you get thin, thick and tapered lines. Takes more time but it's well worth it. You have more than enough space, this is pretty but the blur is taking away from it. I hope (and encourage) you to go back and sharpen some things. Some darker shades on her lips and some shading on the right side of her face would bring out her nose and lips and a slightly bigger chin, and just a different color bg. Otherwise this is cute. Makes me think of Lois Lane for some reason.