So after some skin experiments (I'd already decided to veer away from my Orc skin recipe) I went for this approach:
Small amount of earthshade plus increasong amounts of white, layered on for the highlights
Glazing with purples and blues in the shadows and especially apparent in the faces
Yellow glaze over the teeth
Then final glaze with green ink (and lots of medium) over the skin to remove any chalkiness from the highlighting.
Before the physical blood and gore was added (see below) I washed a mixture of purple and red inks to the hands, feet, knees and elbows (to create a little extra contrast and to break up the large areas of green skin).
Finally I prepped the areas that would be getting the blood effect with a combination of black, purple and red inks, increasing the amount of the latter where the blood was to be most fresh.
After weathering the bases I then approached the blood and gore. Quite simply I used a mixture of Tamiya Clear Red, black ink, UHU glue and a cocktail stick to mix the mess together and to apply it to the areas of stringy, gooey gore. The cocktail stick was used to stretch he goo between two surfaces , for example from mouth to floor. I didn't want to overdo it, so I had to keep restraining myself because it's a smashing effect and easily done. I decided that several of the models would not have any of this applied at all.
With regards to the Ghoul King who is digging out a grave, I decided to use a Tamiya weathering stuck (essentially an oil pastel the colour of mud) and applied this to the grave area, the base and dollop on his shovel too.
Lots of photographs to follow, as I have a new iPhone and have used this as an opportunity to experiment with it's focus and exposure corrections during the shot and it's editing abilities after. I'm pretty damn happy with these: