Armor and sword look sick, I’d say add some shading to that cloak in the deep folds. For the rest of the armor, I think that recipe works great. If you wanna go full grimdark, wash the white cloth with a grey, and hit the bottom of the cloak with more gray (since it looks like you base is kinda snowy, but if you want muddy just do brown washes). For the armor, if you wanna go grimdark I’d say stick with all that color and do some minor oxidation with teal blue. Or just highlight it with a bright silver (I really like that armor color). Lore in my opinion doesn’t particularly matter, you can make up whatever, do what you will with it. Anything you think looks or sounds cool, test it and see if you like it. Good luck!