I don't even bother taping it off when I do the green layer... I start taping after that layer is dry and done. I never have to worry about taping off difficult sections, and ending up with double seams or gaps between the color, that way. I'm sure others will tell you different, thats just how I do it.
In this order:
1. All green sections, no tape.
2. Tape off the green I want to keep.
3. Paint the back
4. Tape off the back over the paint
5. Paint the inner cheeks
6. Tape off the inner cheaks over the paint
7. Paint the red
8. Tape off around the ears over the paint
9. Paint the ears
I don't know if thats gonna make sense (in text) for anyone, but thats how I do it to avoid double seams, and gaps. Like I said before, thats just how I do it, other folks may have different methods.