Heavy WIP for my game's minotaur boss. Feedback wanted.

• Blue lines indicate base of neck
• Yellow lines indicate neck
• Green indicates head (with snout outlined)
• Red indicates eyes

Want to make sure nothing jumps out as blatantly wrong with proportions/perspective before I proceed any further, so that I can correct those mistakes while it's still easy to do so. I am not anything resembling a trained artist, so any advice would be greatly appreciated, even if it seems obvious.