Lovely rendering. Amazing attention to details. Most of the times he light source has a tint to it, and the shadow has a tint reflecting the environment. I added a warm light, a rim light and cool shadow to increase the contrasting and exaggerate the scene a little bit. Grey armour in front of grey environment can be hard to read, specially when values get close to each other. Colouring the background can help the character be more legible.











