Wow! This is absolutely wonderful, I've always been a fan of conceptual pieces of pixel art and this is no exception. The filigree on the inside of the armour is a great touch.
Only critique would be to watch your shading when it comes to different materials and their textures, you're erring more towards the shading of a more shiny material in some areas of the armour such as just below the bust you're not shading it as you would with perhaps the bustier area despite it being the same type of material (presumably.)
But otherwise, it's great! I'd love to see more of your NPC, perhaps some back views as well.
Lettuce be pals.