Is this something you own? If so, choose a better viewing angle!
Maybe practice sketching it (on paper) from a number of angles, till you find the best possible angle for volume readability.
For instance, it's easier to understand from a 3/4 angle like this:

In your version, front and back are not obvious to unfamiliar viewers.
Also the crest is slanted towards the back and not level as in yours, this is an important front/back clue.
As for shading, the problem with bright metal is everything you see is a reflection of the surroundings, and not much more. A very soft light will make everything even, maybe to the point of looking dull. Bright lights will create a lot of speculars, to the point of confusion.
The advantage of drawing over photography is you don't need to be consistent in these reflections, but you need to look hard at it in various light settings. Taking pictures helps, too.