Copied and flipped the other eye, and rotated it into place. Then masked it.
Then added a dodge and burn layer to make the shadowing look (hopefully) realistic.
Have you read these?
I beg you to consider my Layers & Masks Class. It's very cheap, and very comprehensive, and will teach you everything you need to know about this.
No, no, no, it's vitally important to NOT use soft-proofing in Photoshop at this stage, while you're testing labs. Leave it alone.
http://www.damiensymonds.net/2014/07/proof-setup-working-cmyk-not-really.html