Key Logo
Hello Hogslayer
Well I can tell by your plate that you know the legends well.
But as for that image on the key, I'll lay odds that it is in fact a female face (in other words the Valkyrie herself!) - the chin is pointed like a females, and if you look VERY, VERY closely, that "moustache" is actually her upper lip (note the bifurcation on the upper part of it - that's what you see on any persons lip).
As for that shadow, I am not sure on that, but it might be part of the horned and winged helment (at least the part over the left eye - some helmets used to have extra parts for shields for the eyes, sometimes asymmetric (only one side)).
I plan to make a crest (large) of that image for the back of my jacket and some T-shirts , plus a couple of small decals for the Rune itself.
In the end though it doesn't really matter - lots of guys refer to their Valks as "Dragon Bikes" and other things. I guess it's what you make of it for your own enjoyment.
Regards,
Spectre