Some of the photos I took at the museum:
Sketch (initially I wanted to do a small knife, but the helmet just seemed too fun):
Model Progress:
I’m planning on adding a smoothing modifier to the spikes so that I can change their form to fit the reference photos better. Then I’m either adding loops manually within Maya to add the ridges on the upper tiers of the shell, or I’m importing the model in Zbrush to add them there through sculpting. (The helmet is extremely smooth, so I might end up doing a mix. I definitely want it in Zbrush to dynamesh the spikes to the helmet to get the welded look.)