I ended up with Marco Specialties Terminator 2 Skull in a pile of other parts. I had heard that it didn't look very good, and I can see how someone could be sorely disappointed with it. There is very little detail on it, making it look very flat and cartoon-like.
Comparison photos between marco's skull and an original skull.
: Another comparison: https://pinside.com/pinball/forum/topic/terminator-2-clubmembers-only/page/56#post-2140236