UPDATE: September 11th
OK, moving along at a pretty good clip here. I managed to get further along today than I anticipated. Our shift schedule changed a bit, so I had some time this morning as well as this evening to get some paintin' done! 
I began by stenciling on the damage areas on the back panels, then filling the areas to remain Concrete with Winsor & Newton's masking fluid. This stuff is a little more expensive than some of the other liquid masks available, but it lasts forever! I've had the same bottle for almost 3 years now, and it's still more than half full.
Once the liquid mask was dry, I airbrushed on the darker blue-green shade. This is one of two custom colors I use on the whole helmet. The second will come later when I do the gray damage on the dome and lower cheeks.
Here are a couple of shots of the back panels.
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As you've probably noticed, the Panzerolivgrun is on the dome and lower cheeks. Like I said, I had some extra time. In fact, I had enough time to do the PRR Brunswick Green on the upper cheeks as well!
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Not enough progress for today??? Well, you're right! 
I also did some work to the left ear.
I masked off the white arch, then marked the damage with more masking fluid. Then I airbrushed it with Tamiya Flat White. After it was dry I peeled off the masking fluid, revealing the damage.
I also began painting the damage on the remainder of the ear using Testors Camoflage Gray. Tomorrow I'll go back and add the red bits.
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The small black markings on the white arch are dry transfer letters from Woodland Scenics.
These are really easy to use, and they're much thinner than vinyl decals. 
More to come!
