I absolutely like those, and when Kjoldur gets into plate armor, either of those would be spot-on.
I also liked this picture from "The Hobbit" art book:
https://2img.net/h/oi50.tinypic.com/2emimpg.jpg
And some very appropriate helmets:
http://www.hammeredwombat.com/helms.htm
Dwarves take their wars and their beards seriously.