head for Impactor

Hi guys, I am a noob here but I used to kitbash some stuff in the past, like warhammer and some starwars. Anyways, I have identified what I think is a killer mold to represent Impactor
, but the head is not the best. It is a deluxe class mold that I plan to use, so does anyone have any ideas about what might be a good head to use? He has that massive fin running down the middle of his head, but his face has no visor etc.
Any ideas would be much appreciated!
Thanks,
Alex

Any ideas would be much appreciated!
Thanks,
Alex