I like the eyes, dots in the cheeks and long neck. I understand that some styles don't need symmetry but if you are going for that, then you can exaggerate the proportions more.
The hair is translucent,like smoke, I can see the line of the head which is weird. If that is intentional, then make it clear that the hair supposed to look like that by adding some shades or adding some individual hairs, otherwise it looks like a mistake.
She doesn't have ears.
It is hard to give advice based on a single sketch. Maybe show us more if you want.