Nice !
Well if I had to pick, wood elf B, or D (but leaning towards B).
I like the different colors, and I think they all need a little green, and brown.
So the Khajiit, and both Nord ones need trees, or mountains, and I get it's probably sunset for the Khajiit, but maybe trunks of trees (brown), and bushes leaves, and vines (green), maybe some ruins, and some sunrays (they live in a jungle is what I'm thinking).
For the nords, maybe mountains, but with trees and stuff.
Give it color, maybe a torch is lighting the foreground with cloudy snow capped mountains in the background, but darker - fading off into the distance on the left, maybe ruins as well (they all need some kinda ruins IMO but thats just me
)
I just think trees, green. some dark blues, maybe firelight give it more color, and you can do alot with the background on the left side of each picture like with the wood elves.
The one color background just doesn't do it for me, but they do look better that vanilla
I think I like the Breton the best.