If the right eye cavity is distinct from the other face shadows it should have a different left eye position. There is another one which could do this: . This has a circular iris shape and because of the large ridge to its left would appear when the sun was higher in the sky, possibly when it exposes the right eye cavity. It is hard to check these however without accurate shape from shading models of the face and shadow simulations. It could also correspond with another cavity on the right: as which has the same orientation. There are then multiple eye shapes consistent with the idea of appearing in sequence as the sun rose, perhaps blending into each other. Interestingly this is very similar to on the Crowned Face here:

While none of this rises to the level of proof it does build on an early prediction made here .