>>5656175I used allot of different tools for this; mostly the copy, or layer by copy function, magnetic lasso, warp, history brush, paint brush overlay (for the eye color), and smudge tools; also added some noise, highlight, and shadow where necessary. Once you start to become familiar with the tools and functions, the rest is up to your own artistic eye. You basically just play with it until "it looks right", patience is key regarding that. Since it's digital you can always "undo" or "step back", or use the history brush tool if you mess up, that's what's awesome about shop, so there's no need to feel intimidated by it.
There are a number of tutorials on Youtube on how to do stuff like this as well as other things. I learned from a combination of reading threads here and elsewhere, internet tutorials, and just playing around with the software.