For this sculpt progress, I referenced this concept from Lost Bear Studios, and some other references for stylized metal and aliens. 

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I started in ZBrush, making a organic blockout of the head shape before bringing into Maya to model the mechanical parts of the sculpt.  I had to problem-solve translating the concept's pieces into 3D due to 2D pushing reality. 

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After getting the pieces made, I brought it back into ZBrush and roughened up the metal, and completed the detail needed for the organic part of the model.