Thank you! This project loosely follows the guide set forth in "for the love of painting" post on the FoW forum...
Added the sepia filter, then gloss varnished. Follownig the varnish I added a very thin wash of a very dark brown (1pt black india ink, 1pt sepia wash, 10+pts water)
With this dry I've added the metallic paint to the tracks.

1st StuG III G with filter, varnish, and pin wash

2nd StuG III G with filter, varnish, and pin wash

Jagdpanther with filter, varnish, and pin wash
And as a sort of a control group, I've also been working on one more StuG and a second Jagdpanter, with two tone camo (only dunkelgelb and green). These were washed without the varnish step, but otherwise are being finished the same way as the first three vehicles. When both sets are done, I'll decide which method to apply to the Tigers. Also note that the zimmerit on the Jagdpanter is sculpted onto the hull in green stuff.
This Jagdpanter's scheme was inspired by the vehicle in the IWM in London.

StuG III G 2 tone camo

Jagdpanther with zimmerit in 2 tone camp.
As always, C&C welcome.