There's a grand tradition of big guys in massive powered armor with tiny, tiny heads in sci-fi.
I'll admit to not liking the looks of most of the helmets I've had with any of my characters, so I usually turn them off. Sometimes the armor can make it look a little strange but I also just like seeing my character's face in dialogues instead of a helmet; I want to be the hero, not my armor.
I do also run with Body Type 2 so that might make a difference. I have tried Body Type 3 as a male character before and just thought it was too over the top.