If I'm not mistaken, some of those small square missile tubes on the shoulders are (I think) tabled by default to shoot Cyclops. Even if they weren't, this thing still needs to have at least one pair of banks that look like they could fire bombs.
Hmm. Something for you to chew on:
The retail's textures suggest that the big pod greebles extend all the way to the engine exhaust, which makes the whole section look like it's an exposed part of the engine. The current greeble you have is great, and I like it, but I'm thinking what would happen if you added some deeper elements (so the greeble isn't restricted to the surface) and extended it more to the rear, particularly emphasizing some engine structures. I thought of this because I took a long look at your updated greebles, and was reminded of the cooling fins on a motorcycle engine.
I dunno. Now that I read that, it sounds like a lot of work, for not necessarily a result that's much better than what's already there. Doing deeper greebles might also wreck the sleek feel that you've captured so far. Up to you to decide.