Actually the original statues looked quite different.
First of all, they had hats of reddis vulcanic stone.
Secondly, they had eyes of i thought, white coral.
The eyes also had a sideways finish, like the eye of Horus.
And maybe the statue was painted im not sure.
http://www.rongorongo.org/pix/eyes.html The original statues would have looked a lot more impressive. Also, most of the statues have sunk into the ground, they are full body statues not busts.