do you know
this is the thing that bugs me the most
your outline is made up of regular lines, and places that are meant to be smooth... well, aren't.
here's a visual aid to help you out
I copied the outlines from two places that stands out the most: Cirno's head and her bow (1). Notice that the curve (2a) isn't smooth enough: it's easy to know where it bends (2b). This gives the sprite a rather blocky feeling (3). To counter-attack this problem, you'll need to use antialiasing in the broken spots (4).
this is the thing that bugs me the most
your outline is made up of regular lines, and places that are meant to be smooth... well, aren't.
here's a visual aid to help you out
I copied the outlines from two places that stands out the most: Cirno's head and her bow (1). Notice that the curve (2a) isn't smooth enough: it's easy to know where it bends (2b). This gives the sprite a rather blocky feeling (3). To counter-attack this problem, you'll need to use antialiasing in the broken spots (4).