@Sentinel maybe I'm just wrong at calcing, but the calcer says:
28px = 42.1m (Height of Sunny's Mast)
103px = 155m (branch)
21px (background) = 155m (branch)
118px = 871m (Skull Eye Width)
If 28px = 42.1m and 103px = 155m, how can 118px be = 871m?
(1) 118/28 = 4,2 (Sunny's height fits 4 times into the skulls eye). That means 42.1x4,2 is = 176,8m.
(2) 118/103 = 1,14, which means 155x1,14 = 176,7m (which is consistent with (1) )
Calculating the Skull's eye width with 871m is odd, do you agree?
Putting the skull's eye width of 177m into perspective to the whole skull (without horns), the entire skull has a width of around 880m. Which makes sense, because you wouldn't be able to see ships as clearly in front of a 10km wide construct.