These two screenshots show an unused dungeon object in the game, a large skull as a kind of statue object. It's extremely likely, if not certain, that the large skulls were meant to be used in the Skull Woods dungeon, not only because of what it is, obviously, but also because the two screenshots shown here were used when Skull Woods' dungeon was originally loaded.
No idea why they weren't used. I find them really creepy and they would've fit in well with the whole atmosphere of the area.
Source: Flying Omelette