Base coat entire model in Rhinox Hide Two thinned down coats
Heavy dry brush Mechanicus Standard Grey Like very heavy. Stipple if you need to to get in most crevices. This should cover about 90% of model.
Another Heavy dry brush Administratum Grey Slightly less then last. Aim for about 70% of model. Stilple in crevices. Pic is side by side from last step
More of a stipple than a dry brush of Ulthuan Grey Starting from top and hitting where lights would hit. Do not get under crevices. Aim for about less than half of model. Pic is side by side comparison
Now the final layer for this White Scar or any other pure white. Try to leave model stationary and only light stipple the areas only light would hit. So half of last layer.
Khakis (standard issue)
Hit all the areas of the standard uniform with Skeleton Horde Two coats in thinned from this should suffice
Severely medium Damon Gore-grunta Fur and apply in recesses of the Khakis
Green armor
Hit a minimum of two coats of Militarum Green
Leather
Apply one coat on the straps of Gore-grunta Fur and two coats on the backpacks. The one coat with clap chop makes the browns stick out more and appears aged.
Now apply a super thinned down with Lahmian Medium Cygor Brown Over all of the leather areas to darken it further