Inked

I have no idea what that first one is.
The second one lacks depth.
The third one's proportions are too far off to be a human skull.
The eye partially hidden by hair is too far up and too high, the mouth is crooked, the glasses seem to be bent, and the shading of the skin needs actual shading. And the shading looks scratchy.

i like the first one, although im not sure what is it. but as they said, the skull is very disproportioned since usually skulls have cheek bones.