The problem with painting World War One Germans is the exact nature of the colour of their field grey. I've been trying to work out a combination that works on 15mm figures. The above figures use a combination of Vallejo Dark Sea-green mixed with Brown Violet and then highlighted by adding Sky Grey. I'm trying to get a olive tinge to the grey, without making it too green, but not too grey either. I'm still not sure this has worked. In the past with 28mm figures I've just used Vallejo Grey-green, but I don't think it works at 15mm. I may just have to keep experimenting.