also, i think that the lines on the ears are too thick compared to the rest of the head
and as nagato said, mirrored hair looks bad. you can take inspiration from similar style artists such as weooweoo
eye lines look weird, i checked out itachi and his are a lot more subtle and instead of going nearly straight downwards like yours they are at a 45 degree angle, more like this:
img
the shadow under the hair needs softening - i will update with an example later