The left eye shows the sun is coming from the left. There is a circular shape like an iris . This is a significant prediction confirmed as this was thought to be an eye in earlier images. There is a concave shape to this formation so the sun should catch the rim on the left as well as on the right to make it stand out as a circle. It is not however a full circle which makes it less likely to be a crater. 

The right eye appears on the bridge of what appears to be the nose without shadows. This is however the position of the right eye that appears in a Viking image here.

Shown here: In the earlier image the right eye appeared like this: . Interestingly both eyes have a vertical ridge through them which could cast a vertical shadow like a cat's eye.