>>2183794OH GOD HER WRIST.....
For coloring IMO, I would say to ditch the feathered edges on all the shadows... For a simple vector like that sharp and solid edges would look better. You can use gradients on the shadows to fade them a bit, but the soft edges look out of place. This also applies to the pupils
The inner cheeks within the mouth should be a darker shade of red to give some contrast.
Now for the Lineart:
Eliminate the tapered tips on the lines of the joints of fingers in a V shape. They thin out too much and are noticeable. Those kind of tips work best when the fingers are closed as they usually are used to show the pinched parts of the skin. The thumb looks fucked up too.
The hair needs more consistent lines. You have some lines way too thick towards the tapered point, and others that get too thin when they intersect with others... Refer to my image to show how I would have done some of those parts.
Another error most people make when vectoring is not following the natural flow of the lines. Remember, that as a vector artist, one can make any and all needed changes to the original art in order to improve it. This includes extending lines, bending them more or less, or even redrawing something so that it looks a bit more natural.
It might just be me but you might need to fix your export settings. Assuming you are using Illustrator, it seems your antialiasing is disabled or you have it set to "Supersampling (Art Optimized)". You want to use "Type Optimized (Hinted)" for your antialiasing and have Interlacing off.