Weathering the upper hull

I spent a few hours today working on the dirt and grime on the upper hull near the cockpit walkway. It seemed like a good place to start since the walkway looked funny next to a clean hull. Using my trusty palette of pastels, I began the transformation.This quadrant of the hull isn't finished yet. I still have to add the chipped paint effect in the reds, airbrush Neutral Grey along some of the edges, paint the little dark cores of the blast mark near the jawbox, and apply the hull spatter over everything. Below is a photo showing the effect when looking at the whole ship.
I think I'd like to finish off this side of the upper hull (including the mandible). I'm going to work toward that.