it's Sharpy, it need to be smudged alot ...
Your shading is wrong cause i see you didn't know what plate do you want to have on top, first choose plate what you want to have on top where the eyes will be, and then shade it etc etc
also the light shade is too big and sharpy too. If you're using photoshop you can use Blending options or something like that to drop shadow ....
the sides of the head are empty add there some details
3/10