Surprisingly, to me to, the dark orange won out in the poles, by a slim margin. I will of course give permission for the mask and color to change, so the artist has the final say; should my depiction win. However, I like it in the end, because I felt the dark orange balances the overall moc’s color scheme better than if I went with the dark pearl gray. Time will tell.
Also I felt like I was going for representing an element and to me the Dark orange is more representative of Iron. Thus the mask, ie the focal point, should be that color. Like blue for water, red for fire, white for ice and so on. Granted that is my interpretation of elements and not gospel, and contradictions to that view do exist in canon, and the reverse could be argued easily as well.