I see where you’re going with this and it looks like you’re off to a good start. I understand the style you’re going after and the tone of the environments. Keep moving forward and always keep in mind that you may be showing this to someone who has no idea of the mythology. Someone should be able to look at the characters and immediately understand the story without having to explain too much back story. In other words, use as much visuals to tell the story as you can rather than verbal explanation to tell a story. For example, if you draw Santa Claus with a big scar on his face, you don’t have to explain he got into a fight with a polar bear. The fact that Santa is still walking around tells the viewer that he won. Think about elements you can add to your characters that can tell their backstories.