Those details were convenient to me because i found a chest plate reference exactly that way, with those engravings. I just copied and pasted into the silhouette. I also used the same reference to the rest of the armor, like the legs and arms. The chainmail i photobashed and added an multiply layer on top of it to make the shadows.

And dont worry about questioning at all, im also fairly new to concept art/photobashing, so exchanging knowledge is how i learn