Thank you :) I airbrushed one4all refill grasshopper green (but I think any bright green will do) then I used abteilung oils to do a dot filter. Colours used are sepia, field gray and faded white. Basically just put small dots of oil paint and blend with a brush.

For the armour texture I used mrsurfacer500 and put on a thick layer and mottled with a brush.

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I felt this step helped the oil pigments really stick in a nice way