Here's the SW mag cover you're referring to right?
The problem here, is even though there is black on them, I appears to be more for shading than to achieve a smoldered look. Also, as this is a low detail image, I'm not sure the LMO would accept it. He recently turned down a Novatrooper variation as well for the lack of detail in the pic provided. As I said, you can always try it and present the reference for him to decide, but you need to be willing to repaint if that's the final decision.
-iz