DailyDurian @Andrewsimonthomas As someone who just started painting her fine lined tattoos today, I'd recommend either a brand new really fine tipped brush, or one that you're confident has a good tip (not frayed or anything) then, I used BLACK INK to paint the details.
For the red, it's as simple as using acrylic red (a bit diluted especially for that first coat) and let it soak into the plastic for a few days.
I then used an airbrush to spray in some shadowing using clear red. I think it's turning out well!
BTW
@Strangefate - I forgot to mention in the previous post that I found the double ended balljoint (barbell?) for the torso to be approx 2-3 mm too LONG. I ended up shortening it (sliced off balljoint, cut to length, then glued back with a pin) (I've got pics that I'll put up on thefwoosh shortly) Otherwise, LOVED putting this together (and will be getting more)