Just a few comments on my knowlege about Norse Mythology...
Freya wasn't a Valkyrie, actually, she was a goddess of love, beauty, fertility, etc. As it happens, when Valkyrie's chose fallen warriors from the feild of battle, they oly took half. the other half (those who did not go to serve Hell (goddess)) went to Freya's fields of the afterlife (believe it's called folksangr). So in essence she is extremely different from a valkyrie.
Also, Loki didn't exactly see eye to eye with the other gods and goddesses. He was a trickster and a jerk frankly, tricking hod into killing Baldur. Tho i have a problem with the actual connection and references to norse mythology, I freaking love your art.
Sorry if you already knew this, i just thought i'd bring it up.