Thanks for some great input!  I'm not entirely sure how to do some of it (geometry switching, and calibrating my monitor to be specific)  The mouth section is a separate material zone so quite a bit could be done with textures and dislacement.  There is a raised flat area in the center of the forehead for a 'crest' or insignia of some kind, but a spot for decals, unit info or something might be good on that side as well.  I'm fond of the assymetry as well, so maybe just by rounding out the top and bringing that temple area angled more steeply might be enough.  My other thought was to add a sort of communications gizmo on that side.  I think something kind of boxy to contrast with smooth curves of the rest of the piece.