To elaborate on the light source which still needs some work.
-Take the shoulder pads. The light shines from a western diagonal angle.
While on the breast pads, the scales, and the lower part of the armor the light shines directly.
-Metal reflects light really well. That means where the light source hits the armor spot on it should be very lit up. Almost white, but not 100% white.
-As ~Nightmare also mentions. The scales.
The scales need the same light source as the armor as a whole.
Each of the scales must therefore be shaded individually.
Let's say the light source is coming from west. Each scale must be highlighted on the leftmost part and gradually become darker. Not entirely black because that will make the scales look like they bend a lot.
-The shoulder pads could also need a bit of detail. They kinda look like, I don't know, just some grey/black blobs right now
I hope you can use this.