from 1 to realistic, how realistic if not a 1
cranium is definitely too small though
The eyes seem a bit small for my tastes, but I like the detail.
Temple - 0.1 - Apply yourself Anon!
Forehead - 0.2
Eyes - 0.2 - Most important area!!! Focus here anon.
Ear - 0.3
cheeks - 0.3
Nose - 0.4
Neck - 0.6
chin - 0.8 - Approved.
Mouth - 0.9 - Good work here anon.
Most importantly though isn't the isolated details but the overall effect. Pay close attention that your overall shape is homo sapiens sapiens like. Also be very sensitive about the sexual dimorphism between a male and a female crown on the overall shape of the skull.
Here's a shopped version to help offer some direction.