Truly, the construction of King Kahuka's Throne is magnificent, with great details like headlight bricks for eyes, and the two studs in the mouth giving the impression of teeth. But I would say it's more of a statue than a skull. The skull in Skull Island is okay, but keep in mind the part in question is 3 bricks tall and 4 studs wide, so that brick-built skull is roughly 9 times larger. I sympathize with your desire for brick-built solutions over large molds, but I don't agree with you about this particular part.
And while we're talking about brick-built skulls, here's somethign I made a while back that never found a home in a full MOC