@Redfern, yes those areas on the cheeks and the eye divits specifically will be displacement. I'm going to use gray scale displacement maps run through a math node. While the model is not by any means an exact replica in terms of proportions I'm going to remain true to the gross surface details. Next modeling step is the recessions on the head gear pipes...

thanks for the comments.

_oh yeah, I couldn't find any reference for the detailing of the back of the helm... just winged it.