Gonna give some criticism here. The concept ain't bad, but your skull is real rough at the front. Specifically because of the eye sockets aren't properly defined (you basically did banned shading when an eye socket is a spherical dome, which makes no sense for what you're doing)
To fix this issue, just simply make the eye sockets really dark, and define the edges of the eye socket on the inside thinly, like imagine it as like the edges of a wall around a black pit. Same with the nose, the nose is like a sharp edged pit, not a soft edged one.

Another thing is the teeth, they aren't well defined in 3D space, they should be following a curvature where there's a "front" and then "sides". Make sure you more strongly define the front set of teeth and the sides And there's no jaw bones, which make it seem weird.
Also, the blood from the from the eyes could be a bit thinner splitting off and follow the face's curvature a bit more, and the lighting is a bit rough. You should treat the blood like thick "waves" that drip down, rather than lines that don't really follow the flowing down the fact at all.

You have potential, and I give points for that., and to give some positive I think the side of the skull actually looks quite nice, got this strong shadow that gives it depth, the front of the skull is also fine aside from the anatomy and the background is nice. And the concept itself, is good too, it just needs refinement.