I refined few of the thumbs I liked most. Then keep three of them and select few characteristics of each one.
The concept evolve as I go forward. At first I was thinking about a Heavy warrior animated by ancient magic, kind of undead.
Actually it turns into more of a Shamanic Warrior inspired by nomadic tribes.
I 've made the silhouette lighter and look at traditional clothes made of leather, fur and skin. I will try to find good consistency between the character and the creature he rides.
I'm still in the early stage of concept. I hope to push that one further and properly design clothes, armour and weapons.
Feel free to make comments.