Orc Warrior Character Concept Head Anatomy Study

I usually just make random simple stuffs like weapon, rocks and lots of other things that bumps in my head. One day, I got bored and decided to push/challenge myself more and end up making character heads as my stepping stone. This is mostly Inspired by Warcraft and other MMORPG/MOBA that I use to play, and I'm still in the process of figuring out how human/orc bone and muscle structure work and actually give the subject life, background story and personality. I've learned so much from this, and really hoping to improve far beyond this. English isn't my first language, so please excuse any mistakes, I just wanted to share my own experience. -- This is actually my 2nd sketch, you can read the whole story how I end up making this [here](https://forum.sketchfab.com/t/wip-character-head-anatomy-study-stage-1-for-character-art-design/11351), and see the first head sketch. more render preview @ [artstation](https://www.artstation.com/artwork/G91dB)