Growing up, spock and I had a lot in common, quite a bit uncomfortable with displays of emotion (long story), reliance on logic, love of science.
Saw a lot of similarity between his facial structure and Danny Trejo. So, morphed one into the other more or less.
Believe it or not, the hardest part was the stupid pedestal. The Star Fleet emblem. This was done with version 4.6 of Zbrush and at the time, extruding and retaining sharp edges with hard “corners” on it was a problem for me.