These lines are on the inner wall of the shoulder armors, they are too shawllow for a panel line wash, and normal scribing tools can't reach inside the shoulder armor. I sharpened a pin and bent it to scribe those lines. They are not very crips and straight, those spots are hard to take aim.
These layered details are particularly undefined, as if the photos are out of focus. I ran them over with a scribing pen, just to sharpen the corners a little, so I'd be able to do panel washing later.