Looks great

I'd agree a gentler curve to the head shape would be good. Again, I think having a morph or two for this sort of area is good. You could allow the end-user to morph the helmet shape between the narrower, slightly more pointed shape above and something going maybe more bulbous?

Perhaps some sort of speaker grille for the mouth section? (e.g. to transmit the wearer's voice from within the helmet).

I kind of like the asymmetry going on with the head lamp. Maybe the opposite temple of the helmet (from the one with the headlamp) could just be reserved for decals? (e.g. wearer id number, military insignia or whatever)

The other idea I had was to have a smaller, directional light on the other temple... maybe a small lamp on a poseable stalk?

If a more boxy, control panel type idea, then maybe a small LED display showing something resembling a brain scan (or whatever image the end-user wants to add for that mat zone, if you made the LED display have its own mat zone perhaps) would look cool?

Perhaps if you made these various details hideable, it would increase the options?

SamTherapy's latest Dalek Poser figures feature geometry switching controlled by parameter dials, to change various features about. It's a very cool way of providing multiple choices to the end-user...

cheers