These helmets are made after the stunt helmets and not the hero helmets.
Many garrisons will tell you to fill in the seam lines on the front (it is not accurate at all), add correct cheek decals (or paint), add the ear screws, replace the mic tips for more accurate ones, replace the lens to the proper color(s) and repaint the thing to match your armor if you are going to use the helmet.
Then of course add in your fans, ect.