yeah i'd rather do bumps than dents like you did, really you shouold focus on making the armor awesome in subdiv, it'll always look better than sculpted.
the dents don't make any sense, what would have caused this ? the mega blaster ? then the metal should be melted and burnt, not bumped, or is this a bullet from humans trying to defend themselves ? even there, it doesn' tlook like a bullet hole, etc
<- burnt metal ref, notice how the "layers" of the hull are separated and how and where the metal deforms because of the heat.
the faces, as I told you on MSN need a ton of work, the anatomy isn't there yet, I'd focus on sculpting that right instead of the armor ;), focus on where bones are attached, on where fat is, how the different features connect and overlap each other.
anyways, keep it up man