sticking with the "draw what's fun" advice, so here's a knight helmet. The proportions (I think I'm using that right) are a little off from the reference
>head too big
>face plate too flat
it's not 3d, and there's details I didn't bother to include like the 7th breath hole and the shading, but I'm happy with it. gonna try a samurai helmet next with the intention of capturing the 3d-ness.

pro (beg) tip: museums are a great source of images for things like armour and weapons cause they tend to have tons of pictures of them