Here's an overview of armors that need updates / are missing, along with some indication how likely it is that some kind player will donate the time and effort required to play a character to the point where they can take the screenshots.
Cost: Not just crafting costs and materials, but the effort to reach the associated crafters, or get them to craft armor for you (i.e. meet the required reputation). "Free" means all relevant pieces can be obtained on a new PvE or any PvP character with little or no investment of time and gold. Armor sets available below max should always be cheap or free, where as elite armors are always expensive or prohibitive.
Good: Gallery is complete, using the correct template.
Ok: Gallery is only missing headgear, or gallery is complete but images need shop work.
No: Gallery is incomplete, and screenshots need to be retaken.
Attention: Gallery is severely incomplete and requires immediate attention.
Gray needed: The overview/component images in the gallery are of the pre-Nightfall "undyed" color, not the current default color of gray, and should be replaced promptly.