UPDATE: June 1, 2013
Dentage! 
Continuing to move around the dome, I've reached the dent. Arguably the most
recognizable feature of the helmet, there's a ton of juicy detail to apply.
As with the other sections done with a topical paint job, it begins with the main
silver area blocked in.
[ATTACH=full]131404[/ATTACH]
After working in the gray, along with the big streak coming back from the dent,
the nearly finished damage looks like this.
[ATTACH=full]131405[/ATTACH]
There will be some final detailing added at the end of the project. The area surrounding
the dent will receive some pastel weathering, a couple spots of slightly lightened green,
and some of that contrasting pale color within the silver.
Only a couple more damage sections to apply to the dome, then it'll be on to the cheeks!