Nice man you are getting there with the character. you are doing well on the rendering of the cloth areas. I would try to add a bit more contrast to the metallic areas. ( the only difference when it comes to materials is the values so for metal have a bigger difference in value, also think about the planes of the armor and where the light is hitting exactly). But i really like the design ( im really bad at it) trying to learn the whole large medium small ratio for design but it aint clickin so well XD
keep it up u r doing great XD