Photoshop Eye Tutorial 2014

Here's a new digital painting tutorial from me! (Eyes are my favorite thing to draw/color!)
An updated and hopefully more helpful eye tutorial compared to my 2009 one.
Some general knowledge of Photoshop is needed, so this tutorial is at a more intermediate level.
Please let me know if you need me to clarify anything for you!

As requested, based on one of my recent works featuring Leo and Raph from the TMNT.
It's pretty long, but like my previous hair coloring tutorial, I hope it thoroughly explains my thought processes. Most of my color and blending decisions are from experimentation and basically just by what looks good to me! It can take a while, but that's also what makes digital painting fun. :3

I hope to make my next tutorial on digital color blending in general, so if that's an area you struggle with, please tell me so I know what I need to cover next.

Thanks for your support! Enjoy and have fun experimenting in Photoshop!

Original Piece by me:
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Created in Adobe Photoshop CS5