Any tips on painting the eyelids? I'm thinking of doing it, just not sure how to really approach this. I assume for painting the eyelids the PERS doesn't need to be removed?
Nope. Just move them so they are looking up or down as much as they can go in case you get a little paint/Sharpie on them so that you can't see it once they are normal.
If using paint, a very thin brush will do the job. You could use a Sharpie Pen (fine point). Both require a steady hand.
I did this but still didn't think it looks good so I did the eyelid sculpt mod. I highly recommend that mod.