The most important piece will be the large front plaque brass. While the dome shape will be cool, the brass will be the focal point. I've recently been emailing with Donngel (and he emails me back! Promptly! This is nothing short of astonishing compared to my experiences with other SCA armorers) and these are the inspirational images I sent him:
These are all St. Michael, who is a patron saint of mother Russia. There are historical examples of Michael being used on helmet brasses.
I especially like the last one. The pose has plenty of drama and action... and a big, fat spear. And I do like to fight me some spear.
