Here's where my head is at right now (hehe pun):
@Bad80: The pro to your head is it's clean. I like simplicity and smoothness and your art style brings that out. The con is, the mapping feels off. The ears don't look right but the big problem is the eye gap. The eyes seem too far apart and the eye coloring seems pasty.
@Zwift: Your head texture did a great job of picking some really good colors. Some of the curves feel a little messy and that's just a technical thing, along with some lines which appear needing a little touching up. But overall, great job. You really nailed a lot of it, I especially love how you took note of how powerful his stare should be.
@Deut: You took an alternative approach and went for an entirely different profile. That could wind up awesome or terrible based off how you approach the mapping of the helmet, your color choices, and your shading.
So between the three final entries that exist SO FAR, it's between Zwift and Deut. If I had to pick one to wear right now it'd be Zwift, but obviously Deut's is still a WIP.
That's not to discourge anyone from changing or making corrections to what they have so far, this art request is 100% anyones to win still. Just telling you some thoughts.