I think this picture is great (I don't know where it's from):
This part is especially noteworthy:
This is a detail I'd really like to see on most Empire soldiers. I find this one of the most important details to make them feel distinctly Warhammer.It is not uncommon for warriors of the Empire to carry periapts, talismans, charms and other symbolic ornaments. These are believed to bestow divine protection on the warrior wearing them.
Basically I think they need to get all these right (for any unit):
- armor/outfit/weapon design
- armor/outfit/weapon ornaments (e.g. Empire symbols)
- symbolic ornaments (talismans, trophies, etc.)