Hi Rip,
Thank you. I'm no expert when it comes to painting faces, but here goes... I painted the faces using Oil, for flesh color I used yellow ochre , titanium white and burt sienna. Just mix the 3 colors -- initially equal parts for yellow ochre and burnt sienna, then I increase the white as necessary (depends on the skin tone you like). I just got the tip from the links below...
https://armorama.kitmaker.net/forums/56080&page=1 As for the insignia, I just used a very fine tipped brush...its trial and error...
I hope this helps...
Cheers