So undecided?
I really want to add quills, but can't see myself drilling into an expensive statue.
It's easy. Get a micro hand drill. They cost less than 30 dollars usually and comes with a wide variety of razor sharp bits that are as tiny as 1 mm. Then buy some porcupine quills on-line. You can do this on Ebay as well. Paint the quills black or buy them black.
Decide how big you want the quills to be. then look at the base of the quill and figure out how big your drill bit needs to be. Start with a smaller drill bit than you think as you can always enlarge.
Drill the holes to a few millimeters depth and then use some Loctite Crazy glue gel. Squeeze a dollop on a piece of paper or postcard and gently touch the quill base to it and put in hole.
It takes some planning in terms of where you want the quills and making sure you have appropriate symmetry but it is quite easy. The rest is just boring, monotonous work getting the angle, depth, correct and the same each time.
I've done this because a few painted kits came with broken quills and I needed to replace them.
Porcupine quills are perfect because honestly that's probably what they had in mind when they designed the original P1 and P2.
There are flexible ones and rock hard ones. The hard ones definitely look more spikey but they snap off more easily. Joe used to use the hard quills but switched to the flexible ones because they just travel a lot better and still look great.
Since you are presumably not going to be selling this any time soon, this is not as big a consideration but understand if you put hard quills in there is zero chance you are going to be able to replace the head in the styrofoam and ship it without most of them snapping off. Not so with the flexible quills . . .
I'd do this myself but will have the entire head repainted eventually anyway and so I can have Joe put in the quills at that time as part of the repaint.
For those wanting to repaint the entire statue, I'm not entirely sure if its worth it personally. The base is bland to begin, I could care less about the skeleton overspray, no one is going to look at the base. The netting will have to be dealt with if you want to do a full body repaint and that is a major pain. The main eye catcher is the unmasked head and if that looks awesome, the rest of the body in my opinion will be fine.
You'll see when you have the piece in hand . . . you don't really want to mess with the netting if you don't have to. It will add quite a bit of labor to whatever paintmaster needs to be deal with it . . .